I have a 20gal tank that I've had intermittent success with since February of this year. I did a fish-in cycle that took about 8 weeks, and I didn't lose any of the 4 painted platys over the course of cycling. Once cycled, I added another 4 platys (2 bumblebee, 2 Mickey Mouse) and some anacharis. (Side note, anacharis doesn't like warm tanks, and has since mostly died off since mid-April.) Condensed timeline: I lost a couple of fish, replaced some fish with some red wag platys, had some fry, dealt with ich (heat and water changes for treatment). And after the ich went away, I started losing fish regularly. I imagine that the heat and ich probably stressed them out. I lost a couple to wasting away (which I am thinking in hindsight may have been a parasite or fish TB... I'm a "worst case scenario" kinda gal). Throughout this, my tests are showing this following: Ammonia .25ppm (It was at 0ppm, but at some point, it stuck at .25ppm... my tape water tests at .25ppm also) Nitrite 0ppm Nitrates 5-10ppm, depending on whether I went an extra day or two between water changes. pH 7.8-8.0 Temperature was up to 84F while treating for ich. I have since brought it down to 78-80F. * * * * This morning, I lost my final fish. All I have left is some snails that came along with the anacharis. So, I'm not looking to solve any fish death mysteries, I'm just looking for advice going forward. Should I risk more fish and just plop them in there? More fish and treat with a parasite medication? Break down the tank and start completely over? Thanks for any input!