That's a lot of fish for a 30 gallon. The chromis will eventually become 1 as they tend to fight. Scooter blennys aren't actually blennies but dragonets and require a very established tank. I'd pass on them. The rest seems fine, and honestly there are a lot cooler fish than chromis imo.
20 Gallon SPS reef
29 Gallon FW "fat catfish" tank
20 Gallon Long Dart Frogs "Zig" and "Zag"