to answer your questions, please if I miss any remind me.
When I moved from one apartment to my current one, yes I rinsed the substrate, but not the filter. when I do rinse the filter I only rinse it in old tank water that I have taken from the tank, never in tap water.
I am familiar with dosing medications (I’ve kept fish for about 10 years but never such a sensitive fish). I have watched closely for a breakdown in my nitrogen cycle, ammonia has not spiked above .5ppmm, water changes quickly fixed that.
I have a 20 gallon tank or 75.7 liters. I started with 8 fish and am down to 5. there are ramshorn snails in the tank, but no other live animals.
The person I got the fish from is convinced its fish TB. I hope this isn’t true and its something curable. I’m hoping someone in my local fish club can dissect one or all that died to give a definite answer however until I’m able to make contact with him I’m hoping to be able to get answers here as well as local.
I do keep other labyrinth fish, I’ve kept betta in the past and currently have cory cats and honey gourami, as well as an unidentified Parosphromenus that I found at one of my local fish shops. I am aware that most labyrinth fishes are much more sensitive to medications. I’m very worried.
The P. Filamentosus however are housed in a tank by themselves (my P. Unknowns are now living in my community tank and doing very well).
I think what happened is my fault. When I was moving from one apartment to my current one I put a contaminated sponge filter in the same bucket as the sponge filter for my P. Filamentosus. This was not done intentionally and was a fatal mistake. I’m now hoping I can reverse the disease process in the rest of my fish.