Snail problem in a breeding tank

Question
36 x 15 x 18 inch (45 gallons)
7 zebra danios
7 glowlite tetras
4 red tailed black sharks (3 female, 1 male)
4 adult bristle-nosed catfish (3 female, 1 male)
40 bristle-nosed catfish fry (about 1 inch in lenght)
1 batch of bristle-nosed catfish eggs
thousands of nocturnal snails
Tank is roughly 30 months old
2 aquaclear 300 filters (sponge, carbon and bio)
Change 1/4 water weekly if feeding cucumber to fry, otherwise every two weeks.

Tank has been set up as a multi purpose tank.  I wanted it to be an exciting bristle-nosed catfish breeding tank.  Fish have been selected for their dietry needs and there levels of aggression.  The larger fish live almost exclusively on algae, minimising food requirements.  Nocturnal snails have become a unsightly.  I would like to add three clown or yoyo (pakistani) loaches.  These loaches are similar to the red tailed black sharks.  Will the loaches try to feed on the bristle-nosed catfish eggs or fry?

Answer
Water changes should really be 1/3 twice a week....but anyways.....

You mentioned two different fish.

Yoyo loaches are coldwater, and don't eat snails.

Clown loaches will get to be over a foot long. They'll eat every egg you have if given the chance.

The best way to kill snails is to put a piece of luttuce in the middle of the tank, or in a comercial aquarium snail trap. Then take the snails that gather on the leaf out. Or just take them out manually.

Also, they feed on uneaten food and thrive on poorer water conditions, so increasing your water changes, while not getting rid of all the snails, will likely lower the population.