hmmmm....What size tank? I would add nassarius snails if they are available, as well as some nerites. Astreas are a good glass/rock snail. The majority of margarita snails come from colder water and die within 4 months of introduction to our tropical system. Do they have corraline algae on them? I've heard tropical margaritas usually have corraline.
At any rate I'd say #2 is better for a 30 gallon system, depending on stocking levels, feeding levels and such.
Dan
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