I have cleared tanks swarming with MTS using Paretroplus menerambo or maculatus, in 24 hours.
I would sometime move my shoal of Paretroplus tank to tank as snails reproduce.
They would not be geographically correct (being from Madagascar), but from the stock you already have, I see that's not important to you.
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P maculatus above
If they can't crush the large snails, they use the can opener like teeth to pull out flesh
P menerambo below.
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They get large (over 15"), so need space, and do best in shoals of 3 or more
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