My arowana fins started looking rough so I treated with melafix for 7 days I also added salt to the tank I'm limited on med I can use because of my stingray. They are currently in a 55g where in a 125g but that was converted to a sump for there new 600g home. The small tank was only supose to be over the weekend but thinks to plumbing issues it has turned into closer to 2 weeks. Praying to get that fixed this week. Water quality isn't great my canister filters are starting to fail so I had a powerhead running most of the time I have no ammonia or nitrite but my nitrate has an elevated just wondering if he needs to heal or needs more treatment thanks for any help

