HELP! Troubles with thermometer

[BettaOrin]

I just bought my little Betta guy, Orin, yesterday. He's got a 3 gallon tank (http://www.walmart.com/catalog/produ...ct_id=13448744) and plenty of room to swim around... I've got some fake plants in the bottum that he seems to enjoy, but I didnt get a heater, I read today that it is necessary (everyone else had told me that room temp. water was what they needed)
So I went out and got a submersible heater for 2-15 gallon tanks, and I got a thermometer that sticks to the outside of the tank.
I was reading the instructions on how to put the thermometer on and it said to stick it to the outside of the GLASS tank... well, Orin's tank is acrylic... HELP! what should I do? will it still work? poor little guy is cold and walmart would be closed by the time I got there again to see if I could find a different heater.

[xxabc]

I doubt there will be a difference, but I only deal with glass

Acrylic, from what I've heard is - Stronger than glass, more reliable, but scratches so much more easily. Go ahead and slap it on. However, I've heard the temperatures will be less accurate. Usually the outside glass ones are off about 1-2F from the ones that go directly inside the tank, in my experience anyway.

If acrylic is thicker than glass, who knows, it may be even less accurate ? Not very sure.

[doubleatheman]

Acrylic is fine. I do wonder if it's less acurate to read the therm on an acrylic tank. Plastic does not transfer thermal energy as well as glass.

[Neelie]

its exactly the same for acrylic. stick it on. sorted.

[BettaOrin]

quick update - THe heater is doing its job, the water is warmed up and Orin is swimming around like a happy little fishy! :) he's camera shy so i havent gotten any good pictures of him yet, but as soon as I do, i'll post them for you guys.