my one clownfish is not looking too good. I've noticed over the past couple of days he hasn't been eating very much, he'll go up to the food then swim away. this morning i woke up and he's been laying on the sand on his side constantly, he'll lay there for like 10 seconds then swim away like normal. When he starts swimming he looks fine then. I looked at his body and everything looks normal no growths or anything. The water quality is fine, 0 ammonia and nitrites, nitrates are at about 10 right now. Could he maybe be doing something to do with mating?? although he is Not the dominant one so he wouldn't be the one to lay eggs, also he's still young. The spot where he lays isn't where he normally sleeps but he did make it nice and clean. He gets up every now and then and flas around his fins on the sand, it looks like he's cleaning it. I'm hoping maybe he didn't sleep last night and he's just exhausted??? I don't know I'm pretty worried and I don't know what to do, any insight would be much appreciated. Thanks in advance guys.