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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.
Yeah I just like the chromis color not to mention the ease of care. What would you suggest, I see online people have the 5-9 inch size fish in 30 gallons fully stocked with other fish.