so i have a 100g wit two 4 in monos right now with a penguin biowheel 150 and an eheim 2217. i cant decide whether to get a powerhead or another canister. if i got a powerhear id get a koralia 3 and im debating on the canisters either a magnum 350 or eheim 2213. what would you guys do? add the extra filtration or the extra water movement? thanks for the help i just cant decide what to do