I just picked up this tank from my friends father. It was a saltwater tank, I'm going the freshwater route. My big question here is the filtering system. In the first picture you can see the filter box inside the tank. There are 2 800 GPH
pumps and basically 3 shelf areas to add media.
In the second picture(sorry a bit wierd took from inside) you can see at the top there are 3 openings for water to get in. Then on the sides at the bottom there are 2 holes for water to enter.
So right now I am confused on how this works. If I add filter media to the 3 tiers then that water gets filtered before it reaches the pumps at the bottom. Whats the deal with the holes on the bottom. It would appear that any water flowing through there bypasses the filters.
After someone is nice enough to explain this to me, I would appreciate some suggestions on what type of media to put on each layer, and if I can use sand for the bottom instead of gravel. I have the day off tomorrow and plan on buying lots of supplies