Yellow Belly Damsels is a bright blue fish with a darker yellow belly and they are super easy to acclimate into most systems but can get slightly territorial when new fish are added. At 4” they tend to be big enough to boss around others but also small enough that when more aggressive larger fish pressure them they will back down. Fully reef compatible they love corals and rock alike.
They don’t need a ton of space though a 20-gallon tank should be enough to give them the space they need. Make sure they get a variety of meaty foods, flake foods, veggies.
Approximate Purchase Size: 1" to 2"