Yes change water %40 to %50 every day. Get some Metronidazole ASAP. Mix it with his food and feed to him twice a day a least. If that is not working wich it may not get some wet paper towels, lay them on a large plate, take your fish out and lay in on the plate take the metro and dump it into the wound on his head, smear it around in there if you can. Do this untill it goes away. Also continue feeding metro. Get some aquarium salt in addition to this method and he will be fine. Dont be scared to to take him out of tank and treat him, just do it.hi! I am new with FH, I see my fh has a hole in his head. he is very aggressive, and he likes to eat. his poop is brown black not a white poop. But I care about a hole in his head. what do you think? is it fine for him? Do I need Water change?
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I used seachem metroplex. I have have used hikari brand on other fish with internal parasites. Not sure if there is a difference or not besides price. Not sure what your FH cost but mine was just under $400 price of meds was worth it. I bought 3 packs of it since i was treating water, food and directly to wound.did you treat him with Hikari Metro+ or different treatment?