Well i recently bought plants at mah plant store and they must have had snalis on them cuz now i have at least 7 of them crawling around mah 29 gallon tank. About a centimeater long each, and brown spiral shells. Should i be woried about my plants, fish, or anything else like them over populating the tank. Will my angle fish eat them or any thing cuz i think i read somthing like that online.