Actually, there is a formula for working it out the amount required as long as you know the concentration. For 9.5% it comes out to something like .995 ml required to raise 5 gallon to 5ppm.
Heres how to do it for a specific tank size (the 30 gallon he is asking about)
30 gal = approx 114 liters of water
114 liters times 1000 = 114,000 ml
You need to get ammonia to 5ppm
114,000 / 1,000,000 (parts per million) x 5 = .57 ml of pure ammonia
Since the solution is only 9.5% ammonia and not pure you have to convert
.57 ml / 9.5 x 100 = 6 ml of 9.5% ammoni to raise 30 gallon to 5 ppm ammonia or 1 ml per 5 gallon.
Obviously, if the solution wasn't quite as concentrated, say 7%, it would take more.
.57 ml / 7 x 100 = 8.14 ml
