Leopard Ctenopoma Sick With White Stuff On It

[Snakehead232]

My Leopard Ctenopoma is sick with some type of white stuff on it.It has just been sitting around and not eating at all.I have had the problem before and asked a fish store man what to do.He gave me some meds and nothing happened.The past fish later died; and I don't want this one to be next.I have been feeding it guppies every two days.Fish is new and have let it float 30 mins and then added some water and let it go thinking maybe the treatment was a little to late so meds in an empty tank cured it.Other then that nothing new has been added.Tank is 73 degrees and PH is 7.1.Recent 25% water change; and it is in a 20 gallon nano cube setupPlease tell me how to treat this.The white stuff looks slimy.Image Below.

 

[altum angel]

Looks like fungus add tetra life guard with pimmafix and aquarium salt good luck