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Does the turtle have a heat source?
10 inches is too far--how old is the bulb? You should seriously consider getting a MVB--perhaps a westron or Mac bulb.
The thing is --even if you have the tube 2 inches from the animal, it might be giving off little or no UVB---the only way to judge is with a uvb meter. An inch can change everything and nothing.....it is really individually bulb specific.
If you get a bulb that gives off (and has been pretested) for let's say 245 at 10 inches---then you can attempt to guess. But with a F Tube you are playing with the companies that produce them. And they blatantly lie about their products.
I use my tubes for ambient light now if at all.
I thought you said you change the water biweekly. My bad.
Buy one of those inexpensive kits for fresh watr aqua systems...and some dipsticks for nitrates. They come with graphs where you can see what's in your water. You can see how the water quality actually is after those partials. You should test primarily for ammonia levels and Nitrates---and basically the PH will automatically be all screwed up if those things are.
As far as filters you need at least 2x's the power it states on the box for reptiles. I use a fluval 404....is the 200 gallonns all water or water/land? How much is water?
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