I am running 1/0 through my whole system and i have a 1/0 ANL fuse/holder... and right now i have a 100 amp fuse in their, but anyways, i am going to be buying the hifonics bx1500d and i am gonna be running it at 2 ohms for a while untill my current subs blow then im upgrading to two L7's and then im gonna be running the amp at 1 ohm, whut size fuse should i be running once i run it at 1 ohm, 125,150,200????