I have an overflow. I'm sure someone out there is looking for one. I have no need for it right now. Comes with in tank piece, ouutter tank piece and the syphon. All it needs is some slight plumbing and youre set.
$20 + $7 shipping (Lower 48)
I don't know. Anything 55gal and smaller it'd probably be perfect for. I'm not going to set up another tank for a while.
The DT is enough as it is and HOBs are fine on a frag.