Don't need to boost beneficial bacteria if you have media that's well established, if you have cartridge filters I'd look into modifying them with media (cheapest route) or save up and get a good filter as you should not have to add the nite-out.
Yes you can over clean a tank, multiple water changes back to back can also kill fish because of all the fluctuations in water chemistry, you sure you don't have a dead fish in the tank somewhere, or rotting plants? What about excess buildup of uneaten food
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Thank you for the reply!
I have an Eheim 2217, which should be plenty of filtration for a 65 gallon. There may, however, be a dead nerite snail. I've been doing a sniff test on him every other day, but so far haven't had that HORRIBLE smell they emit after dying. I also gave him a little shake this morning to see if he would fall out of his shell, but he's locked in tight. I'm reluctant to take him out of the tank if he's still alive.
Also, uneaten food is unlikely since the only food I've put in is blanched veggies and I promptly remove the uneaten pieces.
Rotting plants may be the culprit. I put some Nymphoides hydrophylla 'Taiwan' into the tank last weekend and they melted back a bit. I was going to give them time to adjust to the tank, but maybe for the sake of my fish I will need to pull them.
I guess I'm just confused why the nitrites always seem to be 0.3 ppm, but the ammonia never goes above 0 ppm. If I'm testing every day shouldn't I see ammonia go up and then nitrite? And if I changed 80% of the water (50% one day and 30% the next) shouldn't I see at least a small change in nitrite reading?
And thanks for the advice regarding the water changes. I'll hold off until the morning to give them a break and test again. I don't want another otto death.