[APD] Tank blackout and making sure fish get enough Oxygen

["Pete" <peteal at sympatico_ca>]

Hello, I was thinking of doing a tank blackout (to help with a persistent
greenspot/dust algae) while I was away on a 5 day trip and doing a good
prune when I get back.

My worry though is the fish getting enough oxygen during the blackout as the
plants won't be making any.  I'd say I have a med fish load.  Any ideas?
I'll probably use a towel on the top of the tank and leave 1/2 of the glass
cover open but not sure if that allows enough air to circulate.  I have a
spray bar which I could raise to get heavy surface agitation.

Tank is 90 gal, heavily planted.

Thanks
Peter.

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