hey bro you have plenty of filtration. when you clean your tank or do waterchanges, clean out 1 ac110 and 1 fx5. alternate the cleaning. your cleaning BB out of your filters. you dont have any rocks or decore in your tank to hold BB either. alternating filter cleaning will keep you cycled.
on an overstocked tank u should never clean all canister filters at once. You have a bacteria or amonia spike. Do 30% waterchange daily until it clears up.
How are you performing water changes? What are you using to treat/condition the water? I think the fact that you are having problems after water changes means that you are actually killing off beneficial bacteria when you do a water change.
Test your water and post your findings.
In regards to your tank being set up 2 years ago....you could have set your tank up 100 years ago, but if you kill off your BB, you will have to start the cycling process all over again.
The real issue is that you have too many fish in your 220. Reduce your stock and you won't have such a battle with water parameters.
How are you performing water changes? What are you using to treat/condition the water? I think the fact that you are having problems after water changes means that you are actually killing off beneficial bacteria when you do a water change.
Test your water and post your findings.
In regards to your tank being set up 2 years ago....you could have set your tank up 100 years ago, but if you kill off your BB, you will have to start the cycling process all over again.
The real issue is that you have too many fish in your 220. Reduce your stock and you won't have such a battle with water parameters.
i honestly dont think its over stocked. its a matter of killing off the BB when cleaning out the filters. i love the way your tank looks scott. ill be over after my vacation with your goodies!
IMHO, This tank is definitely over stocked, if you don't have tests kits and don't know your water parameters, then back to the basics can be a beautiful thing. Too many freshwater tanks are taken for granted because of the durability of the specimens. Once the fish start growing, then so does the load on your ecosystem, so what you did for the tank a year ago, may not work today. You certainly have good filtration but your water volume will always remain the same. However, I would absolutely have chemical filtration on this and just about any tank.
As mentioned in other posts, its probably an ammonia spike and depending on the level, frequent water changes while testing will get things back on track.
a tank can be over stocked as long as long as the filtration can suport it in regards to how u want ur fish to grow or move thats diffent but as long as the water is being turned over enought times and the filter can handle the bio load u can have alot of fish in the tank and that much filtration can handle that load as long as its cycled but i do think ur having problems with ur bb in ur tank id cut down ur feeding i know u feed alot =D and smaller less frequent water changes untill its fixed then back to normal water changes