A sucking loach primarily feeds on algae, detritus, and small invertebrates found on the substrate of freshwater environments. They use their specialized mouths to graze on surfaces, scraping off food. In captivity, they can also be fed a diet of sinking pellets, blanched vegetables, and other plant-based foods to supplement their natural diet.
If the size difference is sufficient then yes it is possible.
In the average aquarium a sucking loach or Chinese algae eater it's more common name will live around 7 - 10 years, but claims of up to 15 years are not uncommon.
They eat Flake, Frozen, Freeze-dried and other fish foood
They eat by sucking its prey
Snails eat by scraping and sucking with their Radula.
No! The betta fish might pick on the loach but it cannot "eat a loch whole", a loach can sometimes bury itself under aquarium sand or hide under aquarium decor, most loaches are shy, and prefer swimming at the bottom. Some are nocturnal, your loach is probably hiding somewhere. Bettas have small mouths and cannot really eat anything whole if it is more than a few millemetres across. Plus, a betta's stomach is only as big as a small bead so I doubt it could eat any fish whole.
Jack Loach was born in 1942.
Keith Loach was born in 1975.
Barred loach was created in 1846.
Horseface loach was created in 1854.
Stone Loach was created in 1758.
Spined loach was created in 1758.