According to google, inca snails are apple snails. There are 2 type of apple snail, brigs (incas) and canas. Canas get huge, avoid them. Brigs (incas) get to about an inch. Have a look here
http
/www.fishforums.net/index.php?/topic/75554-snail-species/
about half way down the page. There is a link on how to tell the difference.
Apple snails do lay eggs but above the water line so they are easy to find and remove. They look like tiny bunches of grapes. You need both sexes for eggs, though female apple snails can store sperm like guppies, so with a female you could get eggs even if you only have one snail.
With shrimps, I'd get a couple to start with and see if the betta leaves them alone. If he does, get maybe three or four altogether. If the betta does eat them then you'll only have lost the first two.
http
/www.fishforums.net/index.php?/topic/75554-snail-species/about half way down the page. There is a link on how to tell the difference.
Apple snails do lay eggs but above the water line so they are easy to find and remove. They look like tiny bunches of grapes. You need both sexes for eggs, though female apple snails can store sperm like guppies, so with a female you could get eggs even if you only have one snail.
With shrimps, I'd get a couple to start with and see if the betta leaves them alone. If he does, get maybe three or four altogether. If the betta does eat them then you'll only have lost the first two.
