DWC BlueDream & BlackBerry

Hi mate , I'm unsure what Bb & BD stand for but from reading the rest , If you fully submerge the net pot the roots won't have air to breathe and you face the possibility of drowning them or creating root rot etc ... have you been top feeding? as you will have to top feed until the first couple roots hit the res , gravity does its thing , is there roots poking out net pots at all ?