Just thought I'd throw this out there for those you like the frugal/ more efficient route, neophos is a good product but it's not very potent. Aquavitros activate, made for planted FW tanks is essentially the same stuff-potassium phosphate but much more concentrated, 5 ml in 180gal of water will raise phos by 0.15 so much more bang for your buck, but obviously because of its high concentration, should be dosed with precision, in most home reef/ smaller applications using a 1ml syringe, like those used in salifert alk/ cal/ mag titration tests would be recommended.