There is algae in my dad's koi pond outside. Should I take some and put it in the 5 gallon for the shrimp?
No they don't eat healthy plants. Actually I've never seen mine eat even dying leaves or plants. I let the sides of the tank build up algae, they pick on that most of the day. I don't think or haven't seen them eat stuff like hair algae or blackbeard algae. They eat leftover food, algae wafers, and will eat bloodworms and black worms and other meaty items. Depending on your feeding and water parameters you may need to supplement some calcium in their diets. Crab or shrimp foods can be purchased. Also cuttle bone can be put in the tank with them, they pick at those. Some of the newest info on them puts their diet in the 60% protein area, which is more then previously thought.Do they eat hornwort or?