Tank size right for ME

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Yoimbrian

Dovii
MFK Member
Feb 11, 2013
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Twin cities
Lots of tank size questions, but I'm looking for advice for my specific situation.

So I've tried searching this, but unfortunately when talking goldfish there are so many tank questions that are closer to "can I use a 1 gallon bowl or do I need a 5 gallon tank?" or "do I need a filter or can i just use the drops?".

Right now I have a 90 gallon (48x18x24) with a 20 gallon sump (bag filter then bio media) and a sponge filter in the tank (not really needed for filtration, but they like to play in the bubbles). The entire surface is covered with water lettuce, that I need to remove weekly or else the tank goes dark. In general my nitrates never go up (from the plants), but I still do WCs weekly for freshness.

I have 7 fancy goldfish, the first of which I got ~10 months ago and the most recent I got last week. They are in the range of 3-5" BODY length now, but getting fatter and bulkier by the day. So I'm starting the process of deciding on the home that they can get to their full / massive potential in. There are 2 ryukins, 3 dragon eyes / moore, 1 oranda, and 1 pearlscale. When I get a bigger tank I'd also add probably 2 ranchu (at least..).

The spot in my house that I've claimed is a wall in the basement, it has a little hall to a bedroom on one side, and a gas fireplace I've never turned on on the other side. It's about 12 feet total, but I want to leave space on both sides so I was thinking 8' length. My two questions come into width and height. For width I'm torn between 24, 30, 36". The upsides for wider are more room, more volume (for stability), and the cost difference is negligible, the downside is it creeps into my living room space and the WAF (wife acceptance factor) and seems harder to clean due to reaching. For height I was thinking 24", but again could do 30 or 36. The upside of height is it is more space and volume and it takes no extra space in the room, but harder to clean and MUCH more expensive (for 24 vs 36 you get 50% more water but 100% more tank cost).

So, for massive fancy goldfish, thoughts on a 96x36x24 (what I'm leaning towards)? is the width a waste could I go 24"? Would I want more height to spend the money on 36" (the tank is $4000 instead of $2000, but the stand and filtration wouldn't be that much different)??

The above situation takes 90% of the weight in my decision. The last 10% is 3 months or 25 years down the road if I am sick of goldfish and want to make something different (like predator with gars / arows or cichlids or rays or a large puffer), would I be stupid to not do different dimensions? (I'm guessing a ton of people are going to say go 4' width for gars / arows, I think that is mostly out of the question with wife approval....probably...).

For filtration I was thinking sump with bag filter and bio media, and then also wanted to do a big sump with grow lights to grow duckweed (mostly to feed the goldfish, but also do suck up nitrates).

Thanks for reading the long thread!!!
 
I don't know much about goldfish but I do know that a 24" wide tank is a great size for most large cichlids so I would assume goldfish would also do well. Would also keep the height at two feet. A lot easier to reach the bottom if u ever need to.


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Any configuration of a tank that large will be fine. Get the tank that best suits your tastes and budget.
 
I think the 96x36x24 are awesome dimensions. It could actually handle most of the predatory fish. You don't really NEED the four foot width for the fish you mentioned. It is however the bare minimum for fish like arowana. Of course for goldfish it should be quite spacious, and they do appreciate the extra space, plus lots of aquascaping room. To be honest 3 ft height is quite nice for a show tank, but price and maintenance ease are hard to justify. Maybe think about a 30" height? Remember though that tank worth tends to drop dramatically right after you buy it, so since you're going custom and expensive, do the biggest tank you think you'll ever be happy with and actually save money in the long run. If it not too much of a PITA, I personally would do 96x36x36 if price is not too big a factor for you.


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I have to say the height of 36" tempts me strongly, would add a lot of cosmetic wow factor. Anyone do a side by side comparison of 24 vs 36? How does it look??

I was planning on doing bare bottom (likely tile or something, but no rock) an then powerheads to push stuff into overflows, so vacuuming should be minimal. But when I do need to how hard is it to reach the corners of a 36 wide 36 tall? And I have the advantage of being 6'2.

I also realize value goes down 75% right after you buy, but there are almost no large used ones in the MN area, and the ones that show up are in bad shape.


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I have to say the height of 36" tempts me strongly, would add a lot of cosmetic wow factor. Anyone do a side by side comparison of 24 vs 36? How does it look??

I was planning on doing bare bottom (likely tile or something, but no rock) an then powerheads to push stuff into overflows, so vacuuming should be minimal. But when I do need to how hard is it to reach the corners of a 36 wide 36 tall? And I have the advantage of being 6'2.

I also realize value goes down 75% right after you buy, but there are almost no large used ones in the MN area, and the ones that show up are in bad shape.


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I know lol that's why I'm saying go big or go home essentially, if you're going badass then go as badass as you can go.


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