clean up crew requirements

[mr_alberta]

If you want sand bed stirrers, get Cerith or Nassisarus snails. For your glass and rocks, get Astrea or Stomatella snails. Nerites are good too as they stay small and can get everywhere.

You really don't need crabs. Any uneaten food will be taken care of by the snails/worms/pods/stars/fish in your tank. Not all snails only eat algae either.

Usually they recommend 1 Snail/2 gallons.