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I also have a 29gal. and I keep about 20 of them in there! I keep replacing them due to my CC star absolutely loves them when they fall on the sand and cant get back over, so right now I probably have about 30 of them in there!
They come in different sizes. If you have like 1.5-2 inch snails, 3 might be enough. A lot of us have smaller 3/4-1 inch turbos. Jermz, how large are your turbos.
it all depends on the amount of LR, age of tank. Better to have too few then too many. If they don't clean the tank like you want then buy some more. Going slow is not a bad thing.