Smaller if possible, they are bulldozers for loose frags, Turbo snails, 1 per ten gallons.
Trochus, 1 per ten gallon.
Dwarf cerith that the blue legs will kill for their shells even if you have empty cerith shells lying around... 3 to 5 per ten gallon.
Astrea snails if you can't find trochus snails, same, 1 per ten gallon.
1 Nassarius snail per 20 gallon, food clean up, not algae.
1 really pretty harlequin serpent starfish per 20 gallon, food clean up, not algea.
If you add too many of anything the excess animals will starve and die.
If you have 8 serpent stars like we do you will end up feeding them the same way you feed your fish.
Our serpent stars - Bright reddish orange, pale purple, (6 to 8" large and possibly tiny fish killers)
Harliquines 4, from red disk and paler 2 tone arms, bright white and black, 2 greyish 2 tones,
2 Brittle fuzzy black serpents, 7", also potential tiny fish killers according to some people.
Make sure you skip the "green death" serpent starfish. They get up to 2' long! Known fish killers even when fed. Heard the pretty yellows get big too.
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