I have algae in my large red devil tank. problem is I think he will eat snails and probably could crush clams if I put them in and he harassed a 12 inch pleco last yearpretty bad, so I dont reallly know where to go from here. if I get some HUGE apple snails will that prevent him from suctioning them out of theyre snails? is theyre somthing I can put in my filter to slow algae? and what kinds of plecos are armoured so he wont want to try to beat on them?? if I buy many plecos will that help to ease his agression per fish? just looking to get rid of some algae in a tank