After your tank is done cycling, definetly get a cleaner crew. For example for a 55 gallon: Scarlet Hermit crabs 50, Turbo Astrea snails 50, Cerith snails 25-50, Nassarius snails 10, Fighting Conch 2-3, Cleaner shrimp 3-4, Peppermint shrimp 2-3, Emerald Crabs 5
I dont like that for a 55 at all.
Hermits 50 would be max
on the snails that is "WAY" to many snails
Fighting conch "Even on this site sais not for a aquarium 100+ gallons!"
the total shrimp that may be the max or even alittle over.
Emerald crabs 5 would be alot they get to around 3 inches I would go with 2 or 3.
And that is for a 55 gallon
For a 24 nano you would want even less!