Algae grows in rivers, ponds, lakes and even the oceans all over this planet. Seaweed is considered a algae of the oceans, sea turtles eat algea. In the fresh water world some fish, snails and catfish eat algae. I have seen aquatic turtles in waters with a large presence of algae. I do not know nor have I witnessed a turtle in their natural environment eating algae, but I would expect if it has nutritional value for other aquatic animals then it should be safe for our turtles too. Your turtle is probably eating it due to the nutritions that algae offers. I'm not gonna say it is or isn't good for your turtle but if he eats it and is active and acts normal then let him eat it. The fish in my tank eat the algae faster than it can grow so I have not witnessed my turtle eating it. Being that algae is in their natural environment. I say, if your turtle is eating it in his/her tank, then way wouldn't he do it in nature. Especially due to the abundance of algae in the wild. I have read in multiple places that blue-green algae is toxic and not favored by aquatic animals. If eaten in large quanities, animals could be killed. So be sure that you don't have that type growing in your tank.
Last edited by slider_keeper
on Tue Jul 17, 2012 1:48 am, edited 1 time in total.