BTA artificial anchor point

Has anyone had any success with some sort of artificial anchoring point for a BTA? Mine is currently happy, but I've had BTAs in the past spend quite a while wandering, only to settle somewhere undesirable (no light, or in the back of the tank, whatever). I was thinking if I could get them to settle into some sort of artificial anchor, I could then move it wherever I want.

I tried a PVC cap once, but it didn't take to it. Anybody else have any success with this?
 
They're just wandering, and if they find a place they like they don't seem to mind the light. I'd just like a little bit more control over where they end up.

I have 6 54w t5s, which I don't think would be overly bright anyway.
 
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