I just got a 30 gallon tank secondhand (I'm somewhat a newby). It came with an aqua-tech 30-60, but all the media is not there, I'd have to get it. I also don't know if I want to deal with the constant waterfall sound. Everything I've read is pointing me towards wanting a canister filter. My questions would be, is there really less maintenance on a canister and when it does is the media more costly than the HOB I have now. I plan on having a sandy bottom with kuhli loaches, neon tetras and some cory cats. Any help on what canister would be adequate or if I'm just worrying about more frequent servicing of the HoB for nothing.