rubbing

My grouper has been rubbing himself on the sand and he has been eating quite well also he has this mark I thought at first was just his coloring it’s not identical to the other side hes hard to tell I was thinking the temperature because I have a glass lid heat gets trapped so it gets hot like...

Hey all, I have clowns in a QT and it’s day 3 only monitoring… Today after a feed I noticed one has started rubbing it’s face occasionally (see Video) is this a cause for concern? Nothing visible on the body, no heavy breathing or anything untoward. They have been darting around more than...