yes the thickness will play a role in the above mentioned problems or in helping negating them. thinner will distort faster.
there are many charts of suggested thickness for aquariums based on volume of water intented to hold, they can be found online if you look for them. For vivs. we use 1/4 until we get to 2 dimesions larger than 24" then 3/8" for added strength.
the closeness to the heat source will be another factor, yes, a regular flurescent or compact flourescent ballast situated an few inches above as is standard will not cause problems from the heat emitted, but if you place a huge ceramic heat emitter in very close proximity you will likely have probs. as with everything else in life it is neccesary to exercise common sence here, cast or extruded, if you heat it enough it will melt or burn.
there are many charts of suggested thickness for aquariums based on volume of water intented to hold, they can be found online if you look for them. For vivs. we use 1/4 until we get to 2 dimesions larger than 24" then 3/8" for added strength.
the closeness to the heat source will be another factor, yes, a regular flurescent or compact flourescent ballast situated an few inches above as is standard will not cause problems from the heat emitted, but if you place a huge ceramic heat emitter in very close proximity you will likely have probs. as with everything else in life it is neccesary to exercise common sence here, cast or extruded, if you heat it enough it will melt or burn.