If you're dosing Excel or Easycarbo then I think you'll be able to go with water changes every other day or twice a week. Especially if you give the tank and filter a really good clean when you have time and remove every bit of detritus you can. If you take your daily dose of Excel and put it in a pipette/syringe then you can squirt the dose directly onto the leaves with the most algae on and this will help kill those bits of algae off - you should see them bleach in a couple of days!lstratton said:okay, I'll keep on going with it. ARGH! I hate doing daily water changes when I have to take 120l out!