STOP THE PIMA/MELAFIX!!. These eels, though tough as nails, have gills that react badly to these 2 meds. They are prone to fungal infections once their slime layer is compromised. A good slime booster will take care of the covering. Salt and temp will fix the fungal infection. I have a 150 not doing anything that I can let them have until I finish the rack for the 4 260s I just ordered.