Ok, so i have a very nice male crowntail betta that i bought about 3 weeks ago. he has been living in a 20gal long that is heavily planted. sharing the tank with him are guppies and swordtails. it is a very peaceful tank. everyone gets along and he was acting and eating great. around the beginning of this week however, he began to act kind of odd. his colors became much more dull, he was less active, he is losing interest in food all together. he just chills at the top of the tank in the plants and doesnt move much which is unlike how he was acting before. i noticed, he is kind of breathing heavier than normal too. what should i do? and what is wrong? would it be a good idea to take him out and transfer him to a bowl and treat the bowl with aquarium salt cause i cant treat my planted tank.