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Should i use a under gravel filter?

I have just bought this tank. http://www.aquariumsdelivered.co.uk/catalog/fluval-roma-125-aquarium-only-p-858.html It comes with a Fluval 3 PLUS filter, but nothing that will oxygenate the water. Having a under gravel filter would fix this though. i want to use a sand instead of gravel and the sand i have bought says on the bag "When used in conjunction with under gravel filters, a layer of filter matting is required below the sand." so i know i can use it with an under gravel filter. but are they worth getting? If so do you have to put the sand at a different thickness at the front compared to the back (not sure why i think that just in the back of my head) If not should I just use the filter it comes with and an air pump?

Public Comments

1. Skip the undergravel filter. Some people swear by them but since you have a fluval you will not need to worry. Undergravel filters put oxygen "bubbles" in the water but all they do is just agitate the water, not oxygenate it. Good water flow is what releases Co2 in the water and allows O2 to enter. Since the fluval is a canister filter it creates great water flow.
2. Buying is an attitude that best at times be governed entirely by this tank
3. No just add an airpump and airstone.