I used to have tanks when years ago and have been out of everything for 10 years or so. I just got a good deal on a 75 gallon tank (this will be the biggest tank I have done) and looking just to do a community tank for my apartment. I got a Aquaclear 500 from my friend and have that running but have been looking at the Fluval 405 as well. I was thinking about just getting the Fluval and having both or should I just use the fluval and take off the Aquaclear. Another question I have never used a canister filter befor and was wondering what the reason for using a spraybar was?? (sorry if I sound a little dumb). I bought a Marineland stealth pro heater 250 watt for the tank and the green light has stayed on all the time. I have it set for 78 and my air conditioning is at 76 I guess the water may not need the heater. After I bought heater then read that people say to split the watts and get 2. Any answers for what I should do about the filters would be great!!! Thanks.