I am still relatively new to reefing, only being at it for about 6 months now. About a month ago my LFS had a 7 head acan for sale for $5. The owner said it was in the wrong section, but sold it to me at the price regardless. It was kinda skinny when I got it, so I fed it every 3rd day and also used amino acids every other day when feeding. It started to get nice and fat. It’s still nice and fat, but I noticed last night that one of the heads I could see what I thought was the skeleton. This morning I put some aminio acids in and fed it once again. A few hours later when I got back, it was all nice and fluffy again, but every 10-30 mins one of the heads gets skinny to where I see what I think is the skeleton again, but 10 mins later it is fat. Is this normal or should I change something?