I just set up this tank two weeks ago and used Fresh Start. It's a 30 gallon freshwater tank that I had put two red tetras in (one died the next day, too stressed I guess) then two red and blue columbian tetras (both still alive), a dwarf Cory catfish (died the next day) an albino plecomas (alive), a peppered Cory (still alive) three dwarf Groaumis (alive), one panda molly(alive), two balloon molly(alive), 2 mikey mouse platy (alive), creamscile molly (alive), four hatchet fish (one died) two African dwarf frogs (alive), phantom tetra (alive) Now I had replaced my two dead fish with 2 jeweled Cory catfish the first week and one just died right now. I'm not adding anymore fish to the tank and I'm worried that either they died because of the move, or because at one point I had the water checked and it was fine and the next day the ph was so high that it was salt water. I fixed the ph level that day. Could that be the reason for the death of my hatchetfish and now my jeweled catfish? I'm doing a water change tomarrow and a filter change to see if that would help. This is my first big tank like this so I'm a little worked about my other fish. Sorry for the long post but any info would be much appreciated.