for humic should I pour it on top of the substrate?
That's what I did, and it did a grea job of lowering the pH overnight. I'll be testing monthly and will report in on how long it lasts. I love that it's an easy solution for when the Aquasoil starts to wear out.
My BKK's/pandas and OEBT's haven't been breeding so I bought some BW Dance. It came in the mail today and I immediately added some to the tanks. Lets see if it works.
I use dance once a week 1 day after the water change. My CRS/CBS are breeding like rabbits but not sure whether it's all attributed to the dance. For now I'll keep using it since it has been in my routine for almost a year.
how many rocks come in a package? and how long do they last?
also did it raise TDS very high?
There are 3-6 rocks in the package (it's a total of 500 grams, and the rocks vary in size and weight). They last for several years depending on how often you clean them. Algae will slowly grow on them, and the only time they really get smaller is when you brush it off (use a toothbrush or similar). Brushing the algae off takes off the top layer of Minerock along with the algae. They are a little crumbly, so brush gently or you may break off larger pieces.
I've had half a bag's worth of them in a 20 gallon tank for about 2 years now, and they're about 1/3 the size they were when I first put them into the tank.
The TDS increase is pretty minor. As long as you don't go overboard with them, you probably won't notice an increase if you do regular water changes.