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Best Answer: Usually common Betta's are very cheap. Ranging from $2.00 to $7.00, but they're are two very expensive breeds. The Western Blue devil is around $600.00 and the Marine Betta is about $70.00.
No, they cannot eat slugs. Betta fish are 1-3 inches long and could not possibly eat a slug. Betta fish eat their prey whole, and their diet usually consists of blood worms, tâ¦iny insects, tiny insect larvae and other freshwater small invertebrates. And by small here, I mean a few millimeters or less, they could not eat something that is their size or larger such as a slug. 7 people found this useful.