Keep Internal Filter or Scrap for Updated Filtration?

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TzuDohNihm

Feeder Fish
MFK Member
Apr 17, 2017
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I am probably getting ahead of myself a bit here as I am still in the process of resealing this tank however the decision to scrap the internal filter is kind of impeding my moving forward on the refurb. See my thread over in the DIY forum if you have any thoughts on my process for resealing it. I would appreciate any that could be offered.

As you can see in the pictures this tank is a Dutch Aquarium Systems flatback hex 175G with an integrated wood frame and some glass bracing internally. I am assuming the glass cross members you see are a structural addition similar to a euro brace but if anyone can explain otherwise I would appreciate it.

The tank has an internal filter system consisting of the overflow box you see pictured in the back left corner with four large chambers that are supposed to house a foam spool with power head sitting atop it, one of which is a denitrating chamber, the third from the left. The two smaller sectioned areas are to house heaters in the small front and rudimentary airstone protein skimmers in the bigger back. Most of the mentions I have seen of this type system online where people have been dealing with a used tank like mine they have simply removed this box and drilled their glass for sumps, etc.

From the other pictures you can see the top back corners have 1 1/2-3/4" holes for wiring and the canopy has wood panels that enclose the top of the tank. Each of those panels has two holes with plastic inserts presumably for lifting them off the tank for access but also for wiring or other things.

I am pretty sure the bottom two panels that make up the base of the tank are not tempered and conceivably could drill the tank however the wood frame on the bottom covers the entire bottom of the tank as you can see in the pictures and I would need to drill the glass and the wood below. I could drill the back but there is a very nice piece of polycarbonate or similar material providing a black background behind the back glass and I would have to drill through that as well and I'm not too sure about increasing my wall distance.

I'd like to go canisters but don't see how I would do it with the tank as is unless I used the holes in the panels on top of the canopy and the glass bracing to hook the hosing for the intakes and returns to but then those components would be "out in the middle of the tank" instead of tucked nicely into a corner and instead of a "clean" outside of the tank I would have black hoses coming over the top and inserting into those panels. Another option I thought of last night while taking these pictures was to bandsaw some sections out of the two panels that fit on the far left and right and just hook the canister hoses over the back of the tank like you would do normally. However, again I am concerned about changing the factory exterior appearance of the tank.

In the SA/CA forum I posted in one of the stocking threads and am looking at SA/CA/Riverine African setup that will be messy and if I go that route have looked at possibly two Fluval FX4 or FX6. If I go with two do people usually put one intake on one side and one intake on another side with the returns creating a cross-flow or does this tend to create a dead spot in the middle of the tank with detritus collecting away from the intakes?

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It seems to me that if you used those boxes as media chambers and ran the whole thing off a powerhead, the resulting filter would be cheaper, use less power, have more media space and be easier to clean than a canister. I would leave it as is. (Just my opinion)
 
I had a local fish tank maintenance guy stop by and he sorta said the same thing. I think I am still too new to post links but if you search Dutch Aquarium Systems and click their link for Aquarium supplies you'll see the Double Layer Foam spools they sell that are meant to go in there.

The local guy said to not even bother with that and to just fill all the chambers with Bioballs and let the overflow run like it should.

I thought about making a DIY PVC filter I saw on YouTube with caps on both ends, drilled heavily on one end with foam inserted at the bottom, filled with ceramic media and then single hole drilled in the top run with a powerhead so I could just pull the tubes out and rinse and clean the foam and ceramic as need be.

The concern I neglected to mention in the original post was as I am resealing the tank the only seals that will not get redone will be the ones behind this box and I wonder if that will eventually cause me any trouble. I don't think so but I have been reading if you redo any seals, redo them all...
 
What is holding the filter box in place? Could you remove it, reseal behind it and put it back in? Very unique system.

Is this the spool?
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If you look at the first two pics you'll see it is siliconed with a bead on the top left and the top back. Similar threads I have found online seem to indicate it is siliconed with a simple swirl and glop on the bottom and maybe on the back in some fashion. Getting it out according to those other threads has ranged from simple stripping those top seals to cutting the box apart and shims on the bottom and back to separate the silicone.

Yes, those are the spools. Like an idiot I did not think to just save the pic and post it so thank you.
 
I think I would want to try and keep it, but would also want to seal behind it if you can get it out intact. The spool would be pretty easy to replicate if you wanted to. You could use 3/4" pvc slotted or drilled for flow, and then stack sponge filters to the desired height. then connect it to a powerhead.
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OK, every bit of resealing advice I have seen online has said "if you're gonna redo one seal, redo them all."

So, as rob said above and I had been thinking I should follow I shimmed out the internal overflow/filter box and it was connected by the beads of silicone at the top left and across the back and pressed into the back left corner silicone seal. The box cracked in the top left corner so if I do decide to put it back in I guess I'll have to patch it up some.

However, now that it is out and it was easier to do so than I thought it would be I am currently considering two options over putting back in what is now a "broken", antiquated and according to all reports on the intarwebz inefficient system:

1) Jigsawing the two teardrops in the back corners to make them as big as the cut glass section and running canister parts through there along with wires for everything else.

2) At this point just going whole hog on this tank and after sealing it back up just drill the thing for a sump.

Again, any and all thoughts are appreciated.

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I finally managed to speak to a DAS dealer since DAS has refused to answer the phone or return calls or emails. I have been trying to figure out what the back of this tank was behind the rear glass. The glass isn't painted, it has what appears to be either a thin piece of black MDF or polycarbonate. The dealer said he has seen DAS use MDF on many occasions so that is going to be my guess if I go to drill this thing.

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Hi Tzudohnim!
My friend just bought a tank very similar to yours. I think it must be the same brand. We are trying to figure out how we can best use it. I saw it for the first time yesterday and told him to scrap the internal filter box. However, we have several concerns. First, we are not sure how the box is attached to the back of the tank and don't know how easily it will be to detach. Can you share some of your experience? Second, in his tank, there are two bulkheads on the right side (looking from the front) one at the top, one at the bottom that seem to be holding the box in place. (box is on the right side) The box also seems to be glued at the back/top lip right against the plastic frame of the tank on a seam. I suggested maybe taking a dremel to it... How did you go about it?
The back of the tank appeared painted, but from your post you say it might not be paint? There's a third bulkhead on the top left portion of the back glass (I think it was used as a return) and the area around it seemed to have peeled off so I was pretty sure it was paint, but now I'm unsure.
Finally, we are considering drilling it to connect a drain/overflow/sump (same as you) but you didn't mention what you ended up doing. Did you drill it?
The tank we are working is 80 inches long, 20 inches deep and 30 inches front to back. It has the flat back hexagon shape... So I am trying to figure out who made it. I looked through the DAS website but I didn't see the same tank. I am pretty confident it's made by whomever made yours although this one has no braces...
Anyway, I am really trying to connect with you because your insights are going to be really important for us...
Hope to get in touch!
-Oscar
 
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