Before you get to what to add, do you monitor your water frequently. There's got to be a reason why your snails "disappear" and that ought to be looked into before you spend your money on additional cleanup inverts.
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I'd keep the whole ocean if my den were big enough
Current Tank Info: 120 gallon reef with 210 lbs. of live rock, Aqua-C EV180 Skimmer, Aquactinic double 250W MH with blue plus t5 support; 58 gallon freshwater planted tank using CO2 and T5s; 30-gallon cube with a few fancy goldfish; and a 110 gallon FOWLR
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