so i have a very compact 15 gallon tank.(its all i can afford and fit inside my house) i have 10 thriving corals, 1 clam, and two damselfish. I recently added a cherub pygmy angelfish, and it seems to be loving its new home, except for the terrorizing damsels. They have been a bit threatening, but it seems to me like they are settling. my blue devil will try to become dominant and my angelfish refuses to become submissive. the damsels don't actually attack my angel, but they torment its swimming. it usually stays within the large hiding spot i created with my live rock. my tank is about 7 months old, and my damsels have only been in it for about 3 months. should i (try to) take them out, or not bother???