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Thank you for the explanation of dissolved solids. And thanks everyone for the information and suggestions. The two remaining fish and my snails are doing fine and the sulfur smell is completely gone. Yep, have no idea why the fish died. Since the parameters matched exactly between the two...

I know not to use soap or anything other than water to clean the tank and decor and gravel. Yes, a nano tank gets pretty dirty in the gravel in a six month period. I generally do a thorough cleaning every 6 months. I was just a few weeks earlier because of the spike in the nitrite.

What did you test for? First I used test strips: ph, nitrate, nitrite, alkaline, chlorine, and hardness. Then I used a test kit that had all the above, plus ammonia and everything was in normal limits or 0. How did you clean the tank? Two of the fish survived and are doing fine. I used just...

Yes, I did clean the substract/gravel well. The bacterial bloom has subsided and the sulfur smell has started going away, so maybe it was being caused by the bacterial bloom? Could it be coming from the foam block even though I rinsed that too? If two tanks have the same parameters and the...

Hello. I have a 15 gallon Fluval Flex. I have had it up and running well since December. I do the regular maintenance and weekly water changes. Everything has been going well up until this past Sunday. I have live plants, mountain minnows and nirite snails. On Sunday when I was doing my water...