Might have lost my exacto blade in tank..(?) What if..

[reefwars]

worst case scenario you got some free gfo for a little while;P

[mrhasan]

Technically, you should be able to find it with a relatively powerful magnet in the water. But I think you should turn off the powerheads so that there is no flow since the water flow MIGHT cause motor effect with the magnet. Just move the magnet slowly around the water and you should be able to attract the blade.