AGHHH! Whole tank crash avoided.... advice needed

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WOW, thank god I work half days on Friday.........

Need advice: I have a yellow tank and blue hippo tang on the sand bed breathing heavy for past 3 hours from deprived oxygen levels. Tank has been returned to normal levels but these two fish are having difficulties recovering. Should I risk the added stress of netting these fish and tossing them in the sump OR leave them be to recover in the main DT. The blue hippo swam for about 30 sec then went back to laying down... watching her swim she was having difficulty as if she was heavily tired. The other fish arnt really bothering these 2 fish. The tank is 30" deep so it will not be easy fishing them out but will if it is necessary.

So if you have experience in this please comment...

Should I move these 2 fish to the sump?
PROS: Better monitoring. No other fish to bother them. Higher oxygen levels in shallow sump than laying on sand bed at bottom of tank.
CONS: 30" deep tank and will be stressful on the fish to net them to sump


Todays story if your interested:
I came home from work today, took a look at my 300 gallon FOWLR, and every fish was at the surface of the water breathing rapidly. 3 fish were not at the surface.... a huge dinner plate sized emperor angel dead on the sand, an 8" fat blue hippo flat on the sand breathing rapidly (not dead yet), and lastly the largest of the 5 yellow tangs is laying flat on the sand breathing rapidly (not dead).

The largest fish were doing the worst so I knew it was an oxygen problem... turns out my reeflo snapper pump got clogged and stopped pumping while I was at work. This pump plays the biggest role in oxygen in my tank because it fuels the skimmer, sump turnover, and agitates the water surface in the main DT. With the pump not functioning that leaves almost no oxygen input into my water. My sprayheads dont agitate the water surface, they are big magnum koralias so if they are withing 5-6" of surface they create a air tornado.

I quickly grabbed a 3000GPH sump pump I use on my pond and started turning the water over while I serviced my pump. Then fished out my massive angel so ammonia wouldnt be building up :(. Tank returned to normal and after awhile all the other fish seem fine. In fact, the smaller fish were barely effected, I guess their oxygen requirements are much lower than bigger fish.
 
RIP.... 8 year old emperor...

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Sorry to hear about your loss, I'd put the korilias toward the bottom then point upward. I'd say its just a waiting game for the fish. Ph is back to normal ? Do you have an o2 test kit?
 

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