1- I would think that 30 degrees is a good temp to set it at. If the temp rises above 30 degrees it won't run and below 30 it will. Personally I don't bother with temp controls. All the aquatherms I deal with are run strictly by a time clock.
2- At least twice per day. I set the ones I deal with for 2 four hours cycles. I don't see why 3 or 4 two hour cycles wouldn't work as well. I set them for a 4 hour cycle to run from 1am to 5am and then again at 1pm to 5pm.
3- the "Danger Thin Ice" sign can be purchased at most hardware stores. I think I paid $40+ for one last year. They are typically plastic and will get fairly brittle in the cold. Be sure to back it up with a piece of plywood for support.
I am sure others will chime in with variations on temps and clock settings but the above is just the way I am used to doing it.
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