So I finally brought my fish back from the dead using tetracycline. All was well for a few days and just yesterday I noticed his fins didn't look good. I had just done a 2 gallon water change (5 gallon tank) the day before. I had also done a 2 gallon water change about 3 days before that (trying to get the yellow out from the tetracycline.) So I thought I would do a second round of tetracycline. I treated the tank once yesterday. When I told the fish store this he said not to use the tetracycline, since he thought the fin issue was from the ammonia level since I told him it was always testing at .5 He suggested doing twice a week 50% water changes and bringing my water in for testing.
Long story short I got home from a trip to the nice fish store an hour away were I picked up two more plants only to find my fish missing a LOT of his fins!!! It was dramatic how much he had lost in 4 hours!!!
When I was at the fish store I talked to them about my water and setup. They were the ones that suggested using spring water since my water out of the tap they tested had 1.0 ammonia levels. They told me spring water still had minerals in it.
So when I saw the huge amount of fin loss I called the store back. He thought the tetracycline probably killed off my good bacteria and what I saw was ammonia burns. He said I should do as we planned which was to do a 50% water change twice a week. I told him I would bring a water sample tomorrow to have him test again (he tested my tank water about a week ago and it was fine.) He said he wanted to test for the nitrites and nitrate levels to see where my tank was as far as cycling.
Now to my question...I did a 50% water change about 3-4 hours ago per fish store instructions. I just went in and checked and the ammonia levels are currently at .5 (which is what they sort of seem to chronically test at for me at home.) Should I do another water change or am I doing more harm than good to change it twice in 24 hrs? Should I just wait till I get the water tested at the store tomorrow? I probably won't be able to change his water again till early evening unless I change it now or in the morning. I didn't want to over change it in a 24 hr period and loose and good bacteria that might be growing.