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[–] ChaoticNeutral 0 points 1 point (+1|-0) ago 

Since you are dealing with a living creature a half ass solution might not be adequate. A very good PID control is $80 and is very reliable. I suggest a Love Controls (Dwyer) 16C-3 with a J or K type thermocouple. The thermocouples can be bought from Omega Engineering. A heat rope below the tank wild be a good heat source. Amazon has them pretty cheap.

I build scientific equipment and haven't had a problem with those PID controllers failing in sensitive applications.