question 1.) because of the movement of the water through the sand at a specified rate, each bacteria can grow on each grain of sand as more oxygen supplied water is flowing over them.
2.)Best bio filter- Imagine all the surface area on all that sand. Each Grain holds an area for the bacteria to live on and you have more then one grain of sand..so it can hold the most bacteria.
B.) I have a 1 year old tank. Good. Established. If I buy another one. The second tank will need to be cycled. correct? yes. WHOOOO. Hold the bus. What if I MOVED the FBF from the OLD tank to the NEW tank. WHOOOO.. now the NEW tank will have a LOAD of ood bacteria so you can immediatly add fish.
NOT so... I choose not to waste my time with you arguing. There are PLENTY of articles on the net reviewing them. I gave some excellent points about them. If you want to disregard them. Thats your choice. I did the research and found its a good investment. IM NOT GOING TO DO THE RESEARCH JUST FOR YOU. your really not worth the time. Sorry.
1.) do the research
2.) find out that they do have many benefits on overcrowded tanks