I would like to get a couple of nerite snails for my aquarium. I know how to care for mystery, rabbit, and giant tower cap snails but is there any specific care for a nerite snail? How many should I get for my 29 gallon if I already have 5 mystery snails (plus 173 babies but I'm selling those), 1 rabbit snail, 1 giant tower cap snail, and 1 Colombian Ramshorn snail? thanks in advance