Hi After a few bouts of algae, and largely thanks to great information and links on here, I'm completely sold on the whole idea of proper plant fertilisation. The tank in question has been set up from about November last year - Rio 300 (standard 2x54W T5 with reflectors). It was all going well for the first few months up to March, then I got various algae outbreaks. I'd added pressurised CO2 the month before but getting to grips with it and having a dodgy drop checker probably meant varying levels. And I was only using Nutrafin Plant Gro if and when I remembered . Anyway, I'm pleased to say that I seem to have turned a corner. After discovering high phosphates in my tap water (> 5mg/l on a phosphate test kit) and initially jumping to the conclusion that they were the cause of the algae, I've done lots of reading and been dosing Seachem Nitrogen, Seachem Potassium and Waterlife Topiflora religiously for about three weeks. Water changes have been upped to 40% a week. I've also got my drop checker sorted out and been spot-treating odd patches of BBA with Excel. It all seems to be working and I'll be switching to dry powders when the bottles run out (KNO3, K2SO4, GH booster & trace mix). My water is very soft (KH 10-20mg/l and GH 20-40mg/l). My question is how to deal with the plants that are left. I've been gradually pruning and removing the worst leaves but not cutting right back or replacing. Having read that ammonium is the major algae trigger, I'm wondering if it would be better to just clear out any algae affected growth in one go? Here's a couple of examples: H. difformis Blyxa aubertii You can see the good growth coming through but the older leaves have some algae left. It's not getting worse, but should I be clearing it out and replanting the new growth?