Hi there!



You never told us how often you are feeding a week.



I third the advice. Move the tank from the window. That's causing 95% of your algea growth. All algea needs is water, some light, and nutrients to feed on. Plus, you're not benifiting your turtle in anyway with supplying Vit. D3 with the tank near a window. Glass filters out a good portion of natural UVB rays from the sun. Your turtle is most likely not receiving Vit. D3, which helps reptiles to sythensize calcium in their diet. Metabolic Bone Disease is a calcium definciancy (sp), and can be a serious situation if a reptile is dianosed with MDB. Not trying to scare you but tell you the truth of the situation for your own benifit as well as your reptile buddy.



Invest in a striplight, and a UVB bulb to put on top of the screen cage. That is, if you're not already using some form of a UVB bulb already.



I third also - look into canister filters. You will be overjoyed - guarenteed - by their proformance. These days, I've fallen in love with Rena canister filters but Fluvals will suffice too.



So to recap:



1. Move tank from window.



2. Invest in a new filteration system.



3. Invest in a fixture and a UVB bulb to put into it. Most pet stores that carry reptiles will have these available. Zoo Med's brand in once choice but I've recently used Exo Terra's brand, and I love them, and Exo Terra's bulbs aren't as costly as Zoo Med's.



Good luck.

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