I got a Fire Fish a week back. it seemed to do great at the beginning. But it started eating less last 4 days. Looking Skinny Now but active as ever, i was feeding Hikari Seaweed rich food, since it was accepting it. after it started to become skinny, i ordered Hikari Omnivore pellets. This change , is it because of any internal parasites or lack of nutrients the fish picks up from feeding ?