Canister filter suggestion

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Carassius Auratus

Feeder Fish
MFK Member
May 8, 2018
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Hello,

This is my first post here, but I have been recommended to this forum for aquarium advice from another, unrelated forum. I have kept fish in the past, like 15 years ago, and just recently, about a year ago, started taking up the hobby again.

I used to keep large aggressive fish like cichlids, piranha, electric catfish (my favorite, he shocked me once) etc. Although this time around I decided to start with my most abused fish, as my username hints. I started with goldfish as a kid and graduated to feeding poor goldfish feeders to my aggressive big fish, now I’m just raising shubunkin and common goldfish and enjoying their peaceful interaction and learning to appreciate their individual personalities I never realized existed. Anyway.. to my question.

I had about 8 (ranging from 2”-4”) of them in a 75 gallon with 2 sponge filters rated for 100+ gallons each, I’ve since moved them into a 125 gallon aquarium and wanted to use a canister filter for them. I did some research and decided to go with a Marineland magniflow 360. I chose this model because it has a high media capacity and I wanted to be able to use Purigen in one of the baskets to help keep my nitrates under control. I was getting about 80ppm in the 75g with weekly 15% water changes. Ammonia and nitrite were always 0ppm.

However, I’ve been having some real issues with this canister, it seems to be sucking in air bubbles constantly (not sure where) because every time I tilt it, it stalls and starts chopping air then sputters back to life. It’s been running a couple of days and every time I shake or tilt it has tons of air built up inside. I came home today to it being completely stalled and the top of the housing was warm to the touch. I shook it and bubbles spurted out and it started running again, then died. I left it unplugged about an hour and tried again, it came back to life, same thing with bubbles. Then died again, then back to life. It’s still running currently, but I’m kind of over it.

I did read all of Marineland’s FAQ and made sure the intake hose is flush with the rib on the intake tube and that the clamp is right up to it. I used channel locks to cinch that sucker down. And the sponge filters are nowhere near the intake, so it’s not sucking in air bubbles from there. The main o-ring was lubed with pure silicone grease prior to installing (scuba diving food grade stuff) and so were the intake tubes on the block that locks into the canister. I’m not sure what else to do. Could be this is defective and has some flaw somewhere. It’s still on the Return period through amazon, so I’m considering exchanging it for something else.

I’m considering a hydor 350 or Fluval 406, these were my other options prior. Either way I plan to get at least two for backup and ditch the sponge filters once the canisters are established. I don’t know much about hydor except that they’re fairly new to the filter market and have relatively large capacities and decent flow rates with the media installed. I’ve known Fluval for years and used their ‘03 models in the past and never had issues with them. Though I don’t know if they have kept up their quality since then. Any suggestions?

Thank you
 
Besides the obvious stuff like if you have a sponge near your intake, or have the intake close to the surface, It could have too much filter floss in it. I know if i put too much of it in any of mine, it will cause micro bubbles. Also try putting vasaline on the Oring to better seal the canister shut. Between those two, your problem should be solved.
 
mattison187,

I only have in it what came with the filter, and in place of the carbon bags I’ve added Fluval BioMax rings. The o-rings are lubed already with pure silicone grease and it still builds up air. It hasn’t ‘died’ again since my first post, but it continues to stall then shoot tons of air bubbles whenever I tilt it and set it flat again. Hmmm.
 
I could afford the fx6, though I’d rather have two filters running for the price of the fx6.

I tried popping open the stop valve block (after the canister was unplugged) and it burst open like a shaken can of coke once I unlocked the lever. Is that typical when removing these valves? I put some more silicone on the o-rings to see if it helps, but still seems to be accumulating air from somewhere.
 
I would still do one fx6 over two 406s any day. The 406 just doesnt pack the punch for a 6' tank imo. With the fx6 you'll get more flow and more media capacity than two 406s, and the 406s will consume more power than the one fx6.

Personally i find smaller canisters useless. An ac110 is a better option than most imo.
 
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I cant give you much advice re cannisters, i'm a sump guy, but reading through your post you say you want to use purigen in your cannister to help with your 80pm nitrate. That's all very well but a bit of advice that wil help you even more with your nitrates is to up your water change. 15% weekly just isn't good enough, especially with goldfish. You need to be around the 50% mark whilst your fish are the size you quoted (2-4"). As they get bigger up to 75% will go a long way to keeping those nitrates in check.

Welcome by the way.
 
For it to stall and suck air bubbles, the only think i can think of is the impeller is not moving smoothly or the flow of water is not smooth. Is anything stuck in the pipe or impeller?
 
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