Fish Health

had a few people in last night buying stuff from me. i was trying to catch my trigger and i moved my powerhead so i could move my rocks around to get him and as i was tired and had stuff to do after the people had gone i stupidly forgot to put it back. this was the powerhead that created the surface agitation that oxygenated my water. so i got up this morning to all my fish gasping on the bottom and my Sailfin, Fuzzy dwarf lionfish and my Regal all dead
i feel like stopping.....i cant...