Mine don't seem to eat bba, green hair algae or blue green algae, little stinkers.
But they munch happily on anything else that crops up.
However, the amano seem to love the hair algae, and the hornwort has wiped out the blue green (it competes, and wins).
(the blue green came in on a plant, and then decided to stay)
I have found that the hornwort is nearly as good a pondsnail magnet as lettuce. Everytime I thin the hornwort out, I drop it in the bucket of old water while I am doing a WC. Then when I empty the bucket, the bottom of it is covered in little snails. they hitch a ride and then fall off. To their doom, because they do NOT go back in the tank! My Assassin likes the easy hunting, but he won't touch the baby snails, so it is just luck whether he gets to the adolescent snails before they breed, and then there is a whole new generation incoming. Maybe I should have 2 Assassins in the tank.
I have derailed. I love your horned nerites. I have 2 zebra and 5 orange with black dots scattered through 3 tanks. No horns. I find that 1 snail per 10g is approx enough to keep them entertained and fed. Any more snails than that and they need quite a lot of added food, and I try to avoid that, because one of my betta likes nothing better than to munch on courgette, and then he gets a swollen tummy. Idiot.
: mature setup; betta, purple rasboras, male guppies, amano and wood shrimp. Heavily planted.
22litre cube tank
: (Tagawa); betta, yellow dwarf shrimp. Pond snails and 1 assassin. Heavily planted.
Midnight in the 57litre tank
(Midnight) ember tetras, 1 amano, 1 ghost, 1 nerite, pond snails, 1 assassin, doing his thing. Heavily planted.
; honey gourami, cherry barbs, green neons, otocinclus, nerites, pond snails, amano. Heavily planted.