THANKS!! yes it is a homemade filter. i built it all by myself and im only a kid!! well actually my dad cut the PVC with the power saw because he said i wasnt allowed..!! LOL! the filter has 4 stages to it, the order goes like this
1st scouring pads
2nd drip tray with filter wool over it
3rd 720 cut up straws (for bio filtration)
4th sponge
it took me a while to build because my dad said it wouldn't work but he finally gave in and now he is very impressed that i came up with the idea.
o yeah... its not a 120gal its a 105gallon, m=not much of a difference but watever!!