What about canister filter vs hang on filter for a large tank? The pet stores are recommending the canister. Since people in these stores are after sales I thought I might ask others in here what their experiences are? I’ve had a hang on filter for years for my 30 gallon. What are your opinions? What is the best filter type for a 75 Gallon tank canister or hang on and why? I’m about to have a large investment into a tank and I’d like to know what you think is best for someone on a budget and also best for goldfish health. The fish are 10 years old, thanks!