They're great for hair algae. Just make sure all intakes are screened off and I don't mean the kind that come with powerheads. You will need a fine mesh screen. I had one and it fell victim to my pump. I think they're made out of marmalade or something. :lol:Beckmola24 said:What would be the benefits of having a Tridachia crispata (Lettuce Nudibranch) in my tank?? I've read they are great for eating nusiance hair algae. Also, what are the cons to this guy??? Thanks in advance!