Well for one thing they can stay still during the day and most of them eat at night so you won't see them move during the day so nothiing has to be wrong. They will eat the excess food from the tank bottom and algae from the glass of the aquarium and so I wouldn't worry about feeding them just yet. If they were really big you may have to give them some wafer food or Crab Cuisine pellets but if they are babies they will get enough food just from the tank unless it is a brand new tank and just been cycled. If you would feel better feeding them get them some food for crabs or crustaceans - I use Hikari Crab Cuisine and give them 1 pellet a day. They are too small to have more than that and they need to be eating the algae and tank leftovers first.
You are also going to want to find another home for one of them before they grow up or you will have not two but 200 little snails. you can really only have one in a tank unless you want to breed them and I will tell you that having snails being bred in a tank is very irritating to some of the fish.
Rose
