My 2 turbo do a relatively good job of cleaning my algae. Of course i have 10+ nassarius and sand shifting star to handle my sandbed. Might be adding a sand dollar.
I suggest to slowly add your cleaning crew. If not enough, add afew more, n continue the process. You don't wanna add 100 snails into your tank, n suddenly have zero algae in afew days and have 80% of them die on you due to lack of algae.
Depends on how paranoid you are, you can look at hermit crabs, sea cucumbers, abalone, bumblebee, nassarius, tronchus snails to start off with. Effective, but look up some of the disadvantages of keeping them.