Please do not put Nerite Snails in with your bettas either. I am sorry to have to disagree with you on that but the only snail I would put in with a betta is a SINGLE Apple or Mystery snail. They will not bother your plants if you want them and are very able to handle the curiousity of Mr/Ms Betta. Just because the betta will not eat them does not mean they will not menace them. But the Apple or Mystery snails are lovely and a single snail is large enough to handle the betta.

One thing about the snails though is unless your tank is good sized be aware that they produce a large amount of poo and your bioload is going to be large. It is going to increase the number and amount of water changes in percentages of water changes and the frequency of tank cleanings. They are advertised as tank cleaners but they will make your tank and gravel dirtier for the betta and bettas are basically pretty clean fish. (contrary to popular opinion the bettas you buy in stores do not know what living in mud puddles is like) and to put them in filth only increases the chance of finrot or other fin or infection issues.

I really am a serious fan of the idea that bettas are much better being a single tank inhabitant. The idea they need "company" is a notion that is the sentiment of the owner not the fish.

Rose