I use bionic, and kalk. I have good results but thats just me. Then again I have a blueface, a coral beauty, and a powder blue and tons of little hermits, lots of snails, so algae wouldnt really have a chance to get started. I dont know if they just eat it all before I see it, or if the undectable Na and Phos are the reason for no algae. I havent had a problem with bionic, except, if you get the gallon jug, and drive around with it the back of a truck, the alk part solidifies. So thats bad, as expensive as it is.