[karimwassef]

I am all for adding bacteria, but I add it directly to regions with high surface area.. Sandbed, rockwork, especially between and around the rocks, cryptic zones, etc...

IMO - I would turn flow off at night and apply the bacteria to the regions with the highest dino populations by day and give it some time (an hour?)... Then turn flow on again.

If some are killed by UV- it's casualties of war.

They usually also say to stop skimming. I don't do that. The extra bacteria population could consume a lot of oxygen, so I keep everything on.