I have used several different types of substrates for emersed culture of anubias and what I see working the best in my situation is flora-max. I believe using it is very similar to using hydroton , the flora max is just irregularly shaped but otherwise the effect is the same. A stable substrate with excellent CEC, and rainage capacity. I have been adding those root fertilizer capsules to the substrate also.
I have enjoyed aquatic/bog aroids for 45 yrs in this hobby, beginning with Cryptocoryne and later Anubias, followed by a host of others I never knew existed ten years ago . One thing I wonder about is the intensity and duration of light we give these jungle floor water loving aroids. I keep thinking we are giving them too intense light when we are growing them emersed. Many of my crypts when grown emersed take on a bronze color, and pattern. In the case of C spiralis its a pretty dramatic change. I grow my aroids in humidomes under 6500 k t8 fluorescent lights about 8 in above the top of the humidome. What would happen if i cut the light in half? by 3/4?
Dan Poliak, a killifish hobbyist from France once told me he has Anubias in all his killie setups and ran a rather weak light for 4 hrs a day.
Just wondering what everyone else's experiences are. Sorry if i am hijacking the thread a bit, I wish we had a place to store all our aroid threads so we wouldnt have to look all over for them. I keep finding posts I have missed because of the shear size of this site and the rapid frequency people post.