I don't know if this was just me, but my BN pleco HATED my eco complete. He tore everything up so much that I had to pass him along. Every night he went to town digging to the glass bottom of the tank
again, this could be caused by something other than the eco complete, but he was fine before I put it in
I have same problem with male bristlenose that dig's down through nearly four inches of black diamond to soil below.
Did it before when sand was only bout two inches ,so when i re-did the soil tank a couple month's ago,,I made the sand deeper but he still delight's at digging like a cat covering poop.
Have kept these fish many times and this is the only specimen that dig's like it does.