I use champagne yeast.
My general diy strategy. I take a 4 cup measuring cup, add 2 dry cups of sugar, then fill it up with hot water. This gives 2 cups of sugar and a little over 2 cups of water. This amount goes in each bottle(I have 3 bottles).
In the beginning, I add a 1/4 tsp of yeast to half cup warm water. After activation, this goes in one bottle with a pinch of baking soda. Repeat for each bottle.
About every 2 weeks, I gently pour out most of the liquid from each trying not to disturb the yeast on the bottom. No matter what, about a cup of liquid always remains. I then add the 2 cup sugar/ ~2 cup water solution to each bottle.
At this time, I drop 1/4 tsp of yeast into half cup warm water. I distribute this to all three bottles to account for any lost yeast.
That's what I do. Works pretty well.
And the HC's not doing so great. What is staying planted is doing great, but more is being uprooted and lost(I don't know how, it just disappears) than is growing. The stuff that is growing looks great, but the fish keep uprooting the other stuff.