I think 1 ml per 10 gal is for PPS Pro and 2 drops (1/10 ml) is for PPS Classic). But I'd PM Edward to be sure.How much trace element should i be adding daily using Plantex CSM+B. Some sources say 1 ml per 10 gallons, others say 2 drops per day. The tank is a ten gallon with 4-5 watts per gallon. I have just started this PPS setup and need to tune it in.