Hi, my pipe from my overflow to my sump broke the other day, i lost water but that is all, i took the opp to change the sumps stand, i do have a dsb in my sump, so this is what i did.. I took out 5cm of sand and put in buket 1 another 5cm in buket 2 and again 5cm in buket 3 as to try and keep the bakt in place, changd the stand and threw in the sand in reverse order, my question is, did the bact survive, did i release all that No3 into my water, and please tell me from a professional view point what u think , thank u plenty