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Arthur's exploding glass experience brings up a question I have.
When my sons' were young we housed reptiles in a 30 gal fish tank
with a reptile heater on the underside of the bottom and pressed
against the glass with styrofoam or taped to the tank (not sure
which). Eventually (after a year or two?) the tank bottom
cracked due, I imagine, to a change in temperature that occured
to rapidly. Since reptile pads are frequently mentioned as a
means of heating the substrate and no posts follow about cracking
bottoms it has me wondering if I should revisit this as a way of
heating the substrate. Should the pad not be in direct contact
with the glass? Or does a water filled tank behave differently?
I seem to be able to grow many plants, however, success with
crypts is hit and miss. I am in Minnesota and our house
temperature is often in the 50's. When I work in a aquarium and
stick my hand in the gravel it is noticeably cooler than water
column temp. Just thought that it would be interesting to
explore the effects of a warmer substrate on crypts. Unless
others say - look elsewhere!