My fish keep dying, and I don't know why, and I'm about to just give up.
We've had a SW
tank for about 1+ years, and everything did fine until recently. For some reason, the tank crashed and everything died. We've given it a while for the tank to cycle, but the fish are still dying.
A few weeks ago, I got two snails which are still alive. Two weeks ago, we measured (with a brand new test) the ammonia at 0, the nitrate at 0, and nitrite just over 0.3. As everything looked pretty good, I got a goby and a red hermit crab and put them in in the evening. By morning the goby was dead. (The crab is still alive). Thinking the nitrites were still too high, we gave it a couple weeks. Yesterday everything tested at zero, so I got a clown. He survived the night, but was hovering at the top of the tank this morning, and now my wife says he's dying.
The tank is 46g with a bunch of rock, gravel bottom, a skimmer, and one powerhead (I think 150gpm). We use RO
water. None of this has changed in a long time.
I don't know what the problem is... any ideas? Otherwise I'm going to quit trying...