I realy love my korallin 1501.
A little undersized for my heavily-stock 180, but running at warp factor 9.....does the job.....
Get a 3001/3002....for a tank over 100 gals IMHO
I have a 1501 and have had problems with the drip rate valve. I can't seem to get a constant drip rate it always works for a few days then slows down until the Co2 builds up to much. Do you guys use the micro powerhead they recommend? has anyone else had this problem?