Melafix label says to change 25% of water after 6 or 7 days. Should i change any water this week or wait like the instuctions say? I noticed the pop eye to days ago on my cichlid and started to medicate the tank yesterday. The fish with pop eye is alittle worse off today. I'm wondering if i should of used other antibiotic petsmart had. My friend sais melafix worked for his fish with pop eye. I guess i should continue with what i started using though. If this fish loses eye will a scab or skin grow over the crater of were the eye was? The fish is still young.