I was a little nervous too when turning up the bubbles. I went from approx 1 bps to about 2.2 last Thursday - Wow. The difference is evident - plants started to pearl almost immediately and are growing by the day. The fish - absolutely no ill-effects what-so-ever. It raised my ppm from 9 to 23.
Leave it at 1 bps for a while and check your Co2 level - you may then want to turn it up again.