Crabs or snail

[Dark knight]

Which of these are best to keep and do a better job of keeping the tank clean. I have fighting conch snail 3 Nass snails and a few turbos.

 

[AdamNC]

I usually use both. Both have their plus and minus. Snails are good for glass and rocks while crabs are good for rock and sand. The bad is crabs will eat your snails. No bads on snails other then Turbos that are mini bulldozers.

 

[rimless75g]

You might have trouble using both in the tank. I would just stick with snails only unless your tank is big and has room for them to not cross path.