Hi I was given a brackish tank 55 gal. It has two needlenose fish, a dragon goby and two white tip sharks. Is it ok to add a fish or two and what would be a safe fish?
Archers & monos both grow to a foot. Either species is too large for a 55g IMO. Those "sharks" (I'm thinking columbian sharks) will grow to 18" & need a much larger tank also.