Petco had some really pretty male sailfin mollies already in salt. I watched them a couple weeks and bought one for my 15 gal nano. After 2 days he will periodically lay on the bottom of the tank. He’ll perk up when I’m around the tank, but this has appeared on the base of his spinal fin and one spot on his left pec fin. You think lympho? It has only presented since the store, he wasn’t picked on while there. His tail is also getting ratty… I know there’s no point in treating lympho, but should I hit him with metro/Kana prophylactically just in case it’s not? He’s eating mysis like a champ. Tank is 1.023 salinity, 78 degrees.