Acohen

Can someone clarify water changes using ich x and Maracyn? do I do water changes daily like the ich x instructions say or do I treat for 5 days and then do a water change?

Hello everyone, I have ordered the med trio but I am unsure on how to actually diagnose and treat my tank. 20 gallons 1-powder blue dwarf gourami 1-clown pleco 9-neon tetras ph-7.2 ammonia- 0 nitrites-0 nitrates-20 My dwarf gourami looks like he has scratched himself on one of the rocks. He is missing some scales and his fins are little messed up. The tetras are looking not so good but they all eat and swim like they always have. I guess my question is, how to I identify if this is a fungal or bacterial infection?