I am not sure you "need" a tubemeter, though it is a nice feature to have along with with the aquatube resevoir and aquaero.
The Aquastream Ultra XT is able to give water temperature reading indirectly.
what do you mean indirectly?
doesn't it work with aquaero? will i be able to get water temps through the pump?
tubemeter only works with aquatube reservoir?