Brown algae is diatoms, not the same stuff as traditional green algae. One snail will jot make a difference in a ten gallon unless it is one huge snail. Snails do poop a lot though, so make sure you have gravel vacuum. Nitrite snails are the best for diagonal and they can't produce in freshwater, so your tank won't be overrunned by snails.
Just get one, as once there is no algae at ll you need to feed the snail algae waffers.
15 Gallon NPT
1g no tech bowl in the making