Atleast you went with the yellow tail damsels instead of the mean domino damsel. My domino became so aggressive to other fish, I had to move him. Can't get rid of it because it is my son's first salt water fish so I'll be feeding it for the next 5 years or so (had it for 2 already). I think the yellow tails stay relatively small so hopefully they won't get too aggressive on you. Your tanks looking good for being so young. Good luck with everything!