Thanks guys! Didn't relise I could just post here!
Ok, here goes:
I've had a
100 Litre (26 gallon) tank for about five months. It had
2 Red Eye Tetras; 2 Neon Rainbowfish Dwarves and 2 Albino Paradise fish.
The pet store guy who sold us our first 2 fish said he never did anything to his tank and he'd never had any problems. He suggested I try and avoid doing them if I could.
Last Thursday I decided, mostly due to brown Algae, to clean and do a 30% water change. Monday (5 days later) I noticed one of the Neon Rainbows wasn't eating and was kind of gasping a little. Within an hour he was up at the surface and doing the same. So I went straight to Google and did a little more research.
I took my water in to the pet store to be tested in order to eliminate amonia poisoning, and was told
all water parameters were normal
When I him about the neon rainbows, he immediately suggested it was parasites. So I kinda desperately bought a bottle of
Protozin and ran home to begin treatment.
Unfortunately the Rainbow was dead in a corner.
I waited a while to see how the other fish were, since they had all seemed fine. I saw the red eyes and the remaining rainbow begin to gasp as well, so I started the Protozin treatment.
Today, the Rainbow and the Paradisefish seem fine. The Red Eyes however are sitting at the top and near the return flow gasping. This evening they also
started flipping their sides up, so I thought they were Flashing, but they only seem to do it when they're near to each other. One of them even did barrel rolls!!!
Otherwise, the
Red Eye's scales seem a bit ruffled, perhaps raised? And the gills seem a little high off the body, but nothing really obviously wrong looking.
Otherwise, I have done
no chemical treatments other than water preperation. I have a carbon filter and an undergravel filter. I haven't added fish in about 2.5 months.
Thanks for the help! It's greatly appreciated!