Damsels can be quite quarrelome and some can grow very large, the only good thing about them is that they tolerate high nitrite levels. Now if I were you I would skip the invertebrates for good, invertebrates unless provided the adequate lighting and filtration can be very tricky to keep, they do not tolerate high levels of nitrate which means lots of regular partial water changes and the use of a protein skimmer let alone special light bulbs for anemones and live corals which also means a lot of work, time and money, fish on the other hand are much easier to keep and maintain, this doesn´t mean that you can skip the water changes, it means that you don´t need to do them two or three times a week like with invertebrates. Resist the temptation to purchase invertebrates, they are for the most experienced saltwater hobbyists.

To assist you on any info about SW, a forum/group called reef central is hands down the best on the web. take the link below and join this group or search the articles and threads for info. I learned much here and questions are answered acurately. Your questions can be answered here to keep what you have alive and healthy. Also, guidence for any additions.

Here is a link that might be useful: reef central

yellow tail blue damsel only reaches 3"