1~What type of fish is afflicted? In addition, please describe what is wrong with the fish to the best of your ability (i.e. cotton like growth, bloated, etc.).
Guppies (guppies, platys, and cardinal tetras in the tank). The guppies kind of get lazy for a while, and then they rest on the substrate and wriggle around for a bit. Their gills are a little red and they're breathing a little bit heavier. Then a few hours later, I find them dead.
2~What are your tank parameters (ammonia, nitrites, nitrates, temp, pH)? Please give exact values.
Test kit values come from an Aquarium Pharmaceuticals liquid Master test kit. (A little old)
Nitrites: more than 0ppm, less than 0.25ppm
pH: 6.8 to 7.4, depending on CO2
3~ How large is the tank? How long has the tank been set up?
10 gallons, it's been setup for about 2 months
4~What type of filtration are you using? Please give the name and number (i.e. Fluval 304) and amount of gph
AquaClear 10 filter
5~How many fish are in the tank? What kinds of fish are they and what are their current sizes?
5 full-grown guppies
Many guppy fry
3 full-grown cardinal tetras
2 juvenile platys
6~When is the last time you did a water change and vacuum the gravel? How often do you do this? How much water do you remove at a time?
Last Sunday, weekly, 40% WCs
7~How long have you had the fish? If the fish is new, how did you acclimate it/them?
Most of the fish I've had for 2 months, the tetras went in about 3 weeks ago. Floating bag for 15 minutes to acclimate them.
8~Have you added anything new to the tank--decor, new dechlorinator, new substrate, etc.?
Been replating the tank here and there. I've always used Prime dechlorinator, no new medications. Regular dosing with KNO3, KPO4, and micros (Plantex CSM+B) for plant nutrition. DIY CO2
9~What kind of food have you been feeding your fish, have you changed their diet recently?
Flake foods, once every two weeks, I give them frozen brine shrimp or frozen blood worms.
Thank you for all your help!