4’ Chinese light bar with green, white and heavy blue for a 12,000 kelvin color. On all my tanks I add iron, iodine and vinegar as a carbon source. No skimming.
On my 55G tumble culture, I load it up: amonia, miracle grow, fish emulsion as well as iron, iodine and vinegar. Because of the fast growing macro in tumble culture, I dose three times a week. On frag growout and 75G display, I dose twice a week.
I have expanded the cultivars of macro in tumble culture. Initially, I grew Gracilaria Hayi with 6’ of LED light bar (fifty four 3W diodes). Because I wanted a different color macro, I reduced the lighting by removing a 3’ light bar to produce a dark burgundy color. Then, I added cuttings from Halymenia digitata, Dragons Tongue, that I am pampering to get into production. This species of Halymenia should grow very well in tumble culture. Two very good reasons for tumble culture is it is a self pruning/cleaning process that produces symmetrical bushes. That saves labor. From my point of view, the biggest advantage of tumble culture is that all surfaces of macro are subject to light and all surfaces take in nutrients. So, in my case, I was able to reduce electric bill and produce a more desirable product with a dark burgundy color.
I like it when everybody wins.