Not so impressed with the cfl's ability to bring on growth this time, although improvements seem to be being made. When I tried it out last time, I had some cracking growth. I think I am going to have to change my pump out for one with a larger bore. I currently have a Maxijet 1200 that only has a 12mm bore, which then opens up to a larger spraybar. This is obviously leading to a lack of pressure once the bore widens, thus potentially not equal coverage. I am also thinking the growth is better not in the direct line of the cfl. I have gone back to vodka dosing to try and get the phosphates down. This is a 2 week screen, only providing 5g per week more than a weekly clean.