Thanks for your prompt reply. Here is everything you thought might be usefull
My tank is approx 40 gallon and water levels are nitrate 0, ph 7.6, ammonia 0. I am running both a water and air pump and average temperature is around 78 degrees. I have 2 fish, 1 is approx 1inch and the other is half ...

i recently bought 2 Hexanematichthys seemanni or aluminium catfish as said the owner. Since i introduced them they have been displaying what i think is some form of agitation. They are swimming along the surface and periodically poking their heads completely out of the water. They have not fed or ...