Not too sure if it will do well on the rock, but I will let someone with more experience with HC to let you know. But I think it would do much better on a fertile substrate.fish fodder said:No, it came on the rock, from AE, i was thinking that any pieces that come away from the rock i could re plant in the substrate. i did want the HC on its own but they were out of stock at the time of ordering.
jay said:If you're getting new growth then it should be fine. Maybe snip off some runners and plant them up in the soil?
Dacious said:The cube layout it looking good!
Is that a hang-on-the-back filter you have? If so will it not drive off CO2 (unless you are going to put fish in it of course)? Also, how much has it cost to set up?
Keep us posted on the progress.