No water shooting out. The air line cause the pump to inject air bubbles into the reaction chamber. DOCs bind to the bubbles and move up and into the collection cup. You can adjust how high the water in the chamber is thereby adjusting the output from 'wet' (a light tea color) to 'dry' (black coffee). I go for just darker than regular coffee look to the skimmate (the stuff that ends up in the collection cup).
Great job so far. I use only Salifert test kits for Ca
, and NO3
as they are titration tests with a sharp color shift so I don't have to match colors of my test result to a strip of paper. Being color blind those close calls don't work for me. The Salifert sharp change of color works great.
Don't chase pH. It will change during the day being lowest at lights on and highest at lights out. Keeping Alk
in line should maintain pH at an acceptable level. If you get an electronic pH meter be aware that it reads much lower than liquid test kits.
Looking great. I'm jealous and now thinking of moving furniture or getting rid of some so I can start another tank
When you're ready for corals get a Hanna phosphate checker. Can't be beat for the price.
If you want some cheato for the sump I can send you some for the cost of shipping (~$9.00). It's time for me to prune mine again.
Keep posting your progress.