I just did an 80% water change and my parameters are ammonia is 0.50ppm, nitrite is still the same and nitrate is 80ppm. There was improvement but my problem now is the nitrite. It didn't decrease. Please help!
Try checking your tap water parameters. You may have ammonia or nitrites in your tap.
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My old filter also hasn't establish any bacteria yet too but I did rewash the filter wools, media and sponges with my recent tank water before using them.
I have a bare bottom tank and it isn't new. I have 2 giant gouramis @ 12", 1 endli @ 12", 1 senegal bichir @ 8" and an ornate bichir @ 12". The tank has already been running for years with once a week water changes. I feed my fishes tilapia fillet and OSI sinking shrimp pellets.
110 gallons with those fish? How regular are you feeding? Also, since you washed everything and you have no substrate, your tank will have no established BB at all. Are you using a canister filter or a trickle filter?
It sounds like your filter is re-cycling. Only thing you can do is keep doing 25% water changes every day/other day and just keep detoxifying the water with prime or equivalent to prevent fish from dying
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