Has been four years since I have had a discus tank or have posted here. Decided to start up my tanks again with discus. I should receive ten juvenile discus this weekend. I have two 75 gal tanks and an emergency 55 gal. I use continuous flow for my primary discus tank. The supply is well water with a pH of about 6.7, a DH of 1 (KH is under 2) and zero nitrates (measured down to 0.1 ppm.) I have a UV assist canister filter and a up flow algae scrubber for each tank - I started these a few weeks ago (feeding ammonia.) Again, while I have kept discus, I am no expert and look forward to learning more here - especially relative to feeding and preferred tank parameters. I do have, from many years experience with keeping aquarium fish, a great deal of experience with many types of filtering systems and their biological properties. So I have a strong interest in that subject especially for discus keeping.