I have a 29g community aquarium currently with an aquatech 20-40 hob filter. I am thinking I probably will need more filtration for this tank and will most likely replace the aquatech with a h.o.t. 250. My question is there seems to be 2 variations of this filter for sale online. One with a bio wheel added to the output (the pro version) and one without the biowheel. For those of you that have the filter, does the hot 250 without the bio wheel do a good enough job of biological filtration for you or should I definitely get the pro version? I realise I could keep my hob filter too but I want to minimise the number of intakes and outputs in the aquarium for aesthetic reasons. Do you think the biowheel is worth the extra cost or is it all marketing?