please help, my honey gourami is lying on his side, struggling to breath. ive just done a water change ( 1 third) and hes been like this for a few days now. his colour is drained also. hes the only one in the tank. the tank is a 55g and is lightly planted with black neons neons medakas corys and an upside down catfish. i reacently removed a krib that was overly agressive and killed his mate. he was also bugging the other tankmates. what should i do? i dont have nitrate or nitrite test kits and will check the parrems this arvo. thanks.