biological filtration

Hey guys I have a doubt about how I can make some bio media for my sump when I don't have enough money to buy the whole bio media. Do you guys have any idea on how I can make one as I have some very porous stone at this point and I wanted to make it into bio media. Is it fine to do so?

Hello, I'm new to the group, but I have a theoretical question for you. If your stocking is low, would it ever be good to intentionally overfeed? Example: You started a tank and did a fishless cycle using ammonia. You would dose up to 4 ppm and the next day NH3 and NO2 would be zero. Then...

Hi all, I am currently running two emperor 400s in my 75 gallon freshwater. right now one of the filters is just using back to back standard blue padded filter pads with carbon bits inside. the other filter has the first line of filtration as the standard filter pad, and then i have filled the...

Does anybody here use Vodka in their aquarium? I have used it in the past to help establish new tanks and seen dramatic changes in water clarity and quality. I think it may have also helped get my biological filtration up and off the ground, but I'm not sure. Anybody else have experiences with...