I'm thinking about getting a large heat rock with a rheostat for my tiger hisser tank. They like sitting under warm lights and I thought they might sit on top of a heat rock. What do you think? I could get an under tank heater but I thought they might be more visable if I put the rock in.

I don't recommend it personal because how many roaches are going to sit on your rock? probably about 1 male and a few females. heat mat will give you more surface area.

Let us know how it goes. It should be fine. How are you planning to seal around the cord (where it enters the cage) for small nymphs that climb it?

I might use a heat mat and a rock for supplimental heat once in a while or for my smaller hisser tank. I just thought it might be fun to try. You're right though, the domiant male would probably sit on it and push all the others off. But that's kind of entertaining
I looked at some rocks in the pet store yesterday and they said not to use them in tropical/humid environments but I saw some online that might work better.
I think I cut a chunk out of the plastic part of my screen top and it should seal pretty tight when i close the cage. I guess I could put some olive oil on the cord too. I'll have to figure that part out still :-)

Don't use olive oil. It has the highest escape rate of the commonly used barriers.

Really? I use it for all my hisser tanks. Seems to work pretty well. I have on a really thick layer on though. What do you think might work better?

Take a quick look here:
http://www.bidabug.org/Forum/index.php?showtopic=1058


Twas my science fair project. ^^