Typically, if the algae is green, it is actually beneficial. It is not usually harmful.



I have had very young box turtles ingest sphagnum. It has never caused a problem for me, but that isn't to say that it can't. It is surely possible. Monitor fecal output carefully, and soak in lukewarm water if he/she doesn't have a movement for a few days. Constipation can cause a lack of appetite.



One main reason that I thought about constipation is the fact that you regularly feed mealworms. In my humble opinion, mealworms offer a much higher risk of constipation than an occasional ingestion of moss. Mealworms are very hard for the turtle to digest, and they often come out much the same way as they went in. Also, they aren't all that nutritious. I know that they are cheap and easy to obtain, but I've halted feeding mealworms entirely. I still feed adult mealworm beetles to my young ornates and deserts.



I've switched over to superworms. You can buy very small to very large superworms from several suppliers via the internet. They are much easier to digest, contain more fat and calories, and are very easy to gut load. They are pretty fatty, though, so I don't offer them as often as earthworms. It's just a thought.



I agree with Steph, it's definitely time to start varying the turtle's diet. Even if vegetable items are only nibbled on or occasionally eaten, they should be offered at least every other day. It sounds like you've been offering them regularly, so that's good.



I'm glad that the turtle seems to be doing better.



The main reason that I asked to see pictures is to observe whether there are any symptoms of calcium deficiency. It sounds as if you dust regularly, so it is unlikely. However, lighting is usually an issue also. Calcium plays an important role in peristalsis...this is basically the process by which food is moved through the intestines. Many people overlook outward signs of calcium deficiency, but it's hard to overlook a turtle that has lost its appetite due to decreased digestion.

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