hi everyone, this is a total newb question that I just want to confirm. But if I have 20gallon tank and use a filter manufactured for 30, 40 or anything greater than my tank, would it drastically improve my waterflow and reduce debris? In essence, is there a positive correlation b/w the performance of the filter? and is it worth buying a filter manufactured for a larger tank when i only have a 20gallon tank? I currently have a "marina" slim filter and it doesn't appear to collect as much debris (ex - poop) as I'd like. there's a foam around the filter that appears to prevent it? it'll be greatly appreciated if you can recommend filters for me. i'm currently eyeing the fluval 205 or 305 external canister filter (which is quite pricey so i am contemplating whether it's even worth it for a 20gallon tank cuz they are manufactured for 50g and 70g i think). I also have my eyes at the AquaClear70 which they are selling for 20bucks at bigals (seems like a great deal) but dunno if it's a good filter. thank you.