Anyone got any experience of automated dosing pumps for ferts? I had a quick look on the net but most of the pumps i see seem to work off a rating of so many milligrams an hour or whatever. I just need to automate adding micro/macro nutrient solutions in 20mg burst once a day. They dont seem to work this way - rather they 'drip feed' in the ferts? Is there anything out there that can work of a timer and deliver a pre-set fluid amount per day? I have discovered that if i am lax in dosing my micro/macro nutrients, even by a day, then some algae is visible. Usually filamentous stuff.