I'm trying to address some macro-nutrient deficiencies in my plants. I think I have it figured out for the most part--except for phosphorus. Whenever I have dosed phosphorus in the past in the balanced amount to go along with the other macro-nutrients (nitrogen, potassium) I have always ended...

I'm planning on starting a new planted tank by January and redoing a current one and had a couple questions about putting together a substrate. Tanks are 20 gallon long and 29 gallon. One will be low light (35W fluorescents) and the other high light (65W + 65W for 4hrs PCFs). Eheim classic...