Under the tank reptile heaters, wil they work for fish?

I was wondering if anyone had used this as a heater for a fish tank
before. Let me know. Some one earlier was worried about it cracking
the glass, but this heater only goes to 95 F and has been on the
underneath side of the tank for two years now and hasn't shown any
signs of cracking. THanks,

Ben

My fiance keeps blue phase white's tree frogs, so I know what your talking
about, but honestly I dont' think it would add an significant heat to the
water, as I think the water would be moving too fast for the invection to
work, and you'll probably need a regular heater instead....