sXeLifer
Fish Crazy
They'll calm down and stop eating the plants once they get your snail numbers down some more, the snails are destroying the plants too so it all takes time to grow back. They do only eat smallish snails, so once they have a hardened shell they will become a challenge for the loaches (normally between 5mm and 10mm shell) so look into some other ways to kill them off. Another way to do it in the early days and if the infestation is really heavy is to anchor some lettuce leaves under a rock once you have put the light off at light off. In the morning it'll be covered in snails, tear the lettuce out (snails 'n' all) and flush 'em. Bear in mind that this will only work when the infestation is heavy. Use it when you only have a light to medium infestation and you'll get some snails but ultimately its just a waste of good lettuce! OR! you could always through some cucumber or other fresh veg into the tank that the loaches can munch instead of your plants. As for everyone else moaning at you. I'm sure you understand that your loaches get pretty big and if you don't then have a nosey at some image results. As a fishkeeper I'm sure your a massive softie towards your fish and will look after them to the best of your ability and if your loaches DO get too big and you cant afford to keep them then I'm sure you'd be wise enough to donate them to a zoo, or sell them or give them to a pet shop.
Hope that helps!
Hope that helps!