My 75 fish only (aggressive) tank is having some problems. My panther grouper has no energy and lays on the bottom all day long. Also all of his fins are starting to wither away. Loss of appetite as well. My tank parameters are all in the ok zone and I've been doing just water changes until I figure out something new. Also my lion fish has some white spots in between the spikes on his fins but I'm not sure if it's ich or just his color pattern. Please help!! Thank you