I do have anoth question? I completely tore my 45gallon tank apart because my Parrot Fish passed away. I’m restarting my 45 gallon tank before I get anymore Parrot Fish or anything else in 3’s. In the process my dog ate one of my Bio wheels and it seems like every wheel I’m buying for my Marineland Penguin Pro 375 Power Filter up to 75 gallons filter C cartridge. I can’t find a replaced for the Bio wheels. The box nor the directions in the box isn’t helping me much either. I did purchase a Marineland Bio - Wheel for a 200B-350B and it’s way too long, it won’t fit. Do you have any suggestions on what type of Bio Wheel I can purchase for this thing. I just want to get it up and going again. HELP!!!!! Lol