I'm just starting my aquarium and have just introduced fish. Originally I bought 2 Three Stripe Damsels and after a few days they were doing fine so I bought 3 more fish,2 more damsels, 1 yellow tail and 1 domino as well as a chocolate chip starfish (I have a 55 gallon tank, so the potential size of the starfish isn't too big of a concern).
In the few days when I just had the 3 stripe damsels I put food in the tank once a day and never saw them eating but I assumed they were because they were very active in the tank. Today I put food in the tank for the 1st time since I added the other fish and I watched the domino and yellow tail pick food out of the air while both 3 stripes did not make much of an attempt to eat and when they did they couldn't get the food into their mouth. Should I be concerned about this, or are the 3 stripes likely eating but just picking food off the plastic plants and/or bottom of the tank.
Also the 3 stripe damsels seem to be acting very aggresively towards the other 2 damsels I just introduced, is this common? And will it eventually stop? The domino and the yellow tail also stay to 1 side of the tank and I have yet to see them even attempt to explor the other side, which I find pretty weird.
As for the starfish as soon as I put it in the tank it crawled over to the glass and climbed all the way to the top, which clearly makes it impossible to feed. Currently I have brine shrimp for the starfish to eat, and I plan on buying some snails to let the starfish eat. Will this be enough or should I make the diet more varied?
Any insight on these questions will be of great help, thanks in advance.