my oscar the past two days has been very lethargic and mostly laying on the bottom not but is laying right side up? This is my first oscar and i got him to eat a little yesterday but I don't know what to do or if this is normal? I checked the nitrite, ammonia, ph, and temp and all are normal. I raised the temp from 78 to 80 to see if that helps his activity but it hasn't please help what should i do ?