Fairly new to tropical fish, and have something going on that I can't quite figure out.
First, my setups is a 75 gallon freshwater tank, filtered with a Rena Filstar XP3 and heated to 79 F.
I have a test kit and every thing from water hardness to PH to nitrogen, etc is normal.
The population is currently 4 Neons, 2 Black Mollys, 4 Platies, a Gourami, a pleco and 2 Mystery snails.
Plenty of elbow room for all in 75 gallons. This setup is about 2 months old and all the fish were introduced in the first 2 weeks and all came from the same source (Petsmart). I feed them TetraColor Tropical Flakes and algae wafers.
Here's what's going on. About 2 weeks ago, one of the Neons began just hanging out at the bottom of the tank and eating very little. In a couple of days he actually appeared to get smaller, and a couple of days after that he was dead. There was never any visable sign of illness, not spots, mucous, parasites, etc. Nothing. Just stopped swimming around, stopped eating, and died.
Now I have a female Black Molly that is doing pretty much the same thing. She almost always stays at the bottom of the tank, has reduced her food intake and appears to be losing weight. Additionally, she is doing what I could only describe as hyperventilating. It's almost like she has swim bladder disease AND gill flukes AND some kind of internal bacterial infection or something. But again, the ONLY indicator of illness is behavior. (and lose of weight).
I currently have her in a 10 gallon hospital tank with heat at 81. I am treating this as a parasite issue since I had to start somewhere. I am using some tablets I got from petsmart that contain praziquantel, diflubenzuron, metronidazole and acriflave. I guess if she doesn't respond to this, I'll try antiobotics next. Anyone out there that can take a guess at what might be afflicting my fish?
Thanks much in advance,