All those behaviours are sounding pretty normal so no real worries there as you have plants and hiding spaces that help to break lines of sight, so looks good to me and having 10 of them is a good number, probably max for your size of tank but ok.
I fed these guys mainly hikari micro pellets, live or sometimes frozen cyclops and daphnia and suchlike.
You can get other types of fish food, just simply grind the larger pellets up into tiny granules and these guys will eat those, actually now I’m starting to remember them more they were greedy little gannets!
Avoid feeding them bloodworms, these are too big for these little guys, made that mistake once and was watching them almost choke on these bloodworms, never again!
Counting them, especially when they dart in and around plants can be annoying, did I already count him or not, here we go again…1…2….3…4… stop moving!!….5….6..
Sometimes best to count them at feeding times and take a few pictures whilst they’re feeding, makes it easier imho.