Hi guys, recently just bought a M size maxmix reactor for my 2 ft tank. I pairing the reactor with ehiem 2213. Just a quick check, coz newbie here. Lst time using a external reactor: I can only see the top and middle blade turning... the bottom blade is like fixed...Cant turn..

But i saw some posts mentioning the bottom blade can turn, so is mine normal? And i can see the column filled with gas(*should be co2, correct me if wrong) around 0.5cm thick, that all...I dnt see any bubbles running around the column. So is it normal? Sorry for the stewpig qn