I use three 2-liter bottles on my 75 gallon with 2.5 watts per gallon, one
on a powerhead and two into the canister filter. I'm usually behind on my
maintenance so, frankly, probably only two of them are fresh on any given
day. It does the job.

kush

WD wrote in message
news:6xNba.64850$S_4.47168@rwcrnsc53...

"Robert Flory" wrote in message news:1XLba.1088

Try a simple DIY CO2 system, the cost is minimal. Effect is amazing.

Bob

With a 75 gallon, I don't think the DIY yeast method will be sufficient. I
have used DIY on 2 tanks up to 40 gallons with moderate success.