Hello,
Well I've had both in my tanks. The gravel never looked quite as good to me as the sand but the water was clearer and I think the gravel would provide better surface area for bacteria to grow on. Also the waste will go down into the gravel to be broken down and I siphon it out later. I know the sand has alot more surface area but unless you stir it constantly or have water flow through it then it would not help much. What do ya think?
Well I've had both in my tanks. The gravel never looked quite as good to me as the sand but the water was clearer and I think the gravel would provide better surface area for bacteria to grow on. Also the waste will go down into the gravel to be broken down and I siphon it out later. I know the sand has alot more surface area but unless you stir it constantly or have water flow through it then it would not help much. What do ya think?