Im fairly new to fish keeping and have had my first tank running for around 5 months now. I fully cycled it before adding fish and its a 20 gallon long.
I have a school of 5 Panda cory's, 3 fancy tail guppies, 2 platies and a dwarf neon Gourami. They all seem to get along fine except the Gourami can be a abit of bully now and again. My current water parameters for ammonia, nitrate, nitrate are all reading zero and have been for a long time. I perform a 30% water change once a week and the last one was friday.
All my other corys seem fine they are a healthy colour, no sign of fin rot and rooting around with their barbels. I have a smooth gravel substrate. The tank is temporary as i have a 40 gallon cycling with newly growing plants.
Anyway to get to the point one of my corys is very pale- almost white like they are sometimes in the lfs, he is laying very still on the bottom of the tank and has been for 2 days now, the only other thing i noticed is that his top dorsal fin looks a little ragged like the top part curve of it is missing (if you get me).
Im not sure what to do, because my other tank is cycling and no where near ready, i dont want to add anything to the tank without knowing what is wrong, and i havent added anything new to the tank.
I use liquid tests for ammonia, nitrate and nitrite but sticks for the rest.
PH is showing as 6.4
GH - 125
The only thing thats changed in my tank of recent is that I removed a chinese algae eater having come to the realisation that he was aggressive having been mislead into believing he was a siamese fox.
Please help, unsure as what to do!