Hi every one. Ok this is what I have read but am having a little trouble fuguring it out.
1.3 kg O2/kW-h (2.15 lbs./hp hour)

Os consumption can be estimated at about 50% of the feed rate.
in a system fed 4.5kg of feed over an 18-hour period, the estemated oxygen consumtion rate would be about .125kg O2 per hour.
so you need a blower about .275 kw (1/3 hp)

that is from the Southern Regional Aquaculture Center publication number 453
Recirculating Aquaculture tank production systems
A review of component options

I myself am trying to figure out just how much air i will need for a 15'x15'x5' cement tank that is heavely stocked.

Is it right you should feed about 5% of the body weight per day?

The little system at home is really running well but am trying to scale up and set up the first Aquaponics greenhouse in the country. would apreciate any advice any of you vetrents have
thanks yall
sanford