I have made holes in a tub before with a tool on my swiss army knife. How many holes depends on where you are. I would say, start out with a few, add more if needed. Easier to make more holes than to cover up holes. Tubs are definitely better, imo. Definately make sure you have a thermostat on your heat pad/tape. I'm a huge Herpstat fan. Tried a hydrofarm, meh, it will get you by for awhile, but sucks, IMO. Foil tape will stick the heat pad to your tub. Don't know that I would leave plastic wrap stuck to it though. Btw, soldering irons are cheap at Sears.
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