we had a serpent star in our 24 aqua & it did just fine until we had an emergency & had to leave town for a few days
unknown to me the misses feed the fish & so did I so they were dbl feed plus reg feeding
needless to say when we returned found out the tank had spiked so we lost a lot of things in it including the serprnt but thank heaven we didnt lose everything
we still have a couple astaria stars that survived
ive also seen a few stars in tanks as small as 10 glln as long as they arenot to large you should have no problem