Riparium Planter Fertilizing
Riparium plants are planted in individual little "pots" which hang partly in the tank water, and like all plants, they need feeding. One way to feed them, like for submersed plants, is to fertilize the water in the tank. Based on what I see, this is not optimum fertilizing. Another way is to fertilize the planter mix in each planter.
I'm wondering if Osmocote would be a good fertilizer for this use. Osmocote is pellets of fertilizer coated with a material that only allows a small amount of the nutrient to escape in any given time - a time release fertilizer. Of course, being a terrestrial plant fertilizer, Osmocote contains a lot of ammonia/urea as part of its nitrogen component. And, ammonia and urea are not recommended for aquariums.
Does anyone have any thoughts about how Osmocoat would work as the fertilizer for Riparium planters? I'm asking because Tom Barr has suggested that Osmocoat under an aquarium substrate would be a good way to get a nutrient laden substrate, partly because the nutrients can't dump into the water, but are only slowly released, thus won't do any harm. This suggests to me that it would be ideal for riparium planters.