Hi. I read on another website that 30 gallon is the smallest tank for a canister filter, anything smaller is served well by a power filter. I see that Petsmart has the Fluval 205 for 69.99 online and I think I saw it for even less in the store. I wonder if this is too good of a deal to pass up? Most reviews of the filter are positive except that it blows gunk back in the tank after cleaning. The Aquaclear 30 (150gph), that I've also considered is around $34 in the store. Any advice or input is appreciated. Thanks.