If you are using cotton to tie the net together, or if the netting is cotton itself, this degrades under water extremely quickly. I have tried this and it lasted a week.I have tried for ages to get ricca to stay submerged. It wont attach to the tuffa rock I have in my tank. (purely there to keep the ph from crashing due to no kH in our water and sand / potting soil subrate)
I have used 'granny nets' to attach huge clumps to the rock, completly covering it 1/4 inch thick and completely covering it all in a double layer of 'granny hair nets' it still manages to get loose and float again within a couple of weeks. The entire top of the tank is now covered with it in thick mats and i'm actually feeding it to my cichlid tank to keep it down a bit.
Any idea's of what I might be doing wrong? No surface movement at all, and now due to the thick mat of ricca its starting to get a bit 'slimy' on top of it and I have to dunk it down to break up the surface scum thats forming. I have labarinines in there so need to keep the surface 'beathable'
Love the plant but its starting to cause me more problems than joy.
I know a lot of sites give advice saying "simply attach with black or green cotton" but they clearly haven't done it themselves, or did it as a temporary display.
I am currently using plastic netting and fishing line, wrapping a thin layer of riccia around weighted plastic (simply because I recycle, and bits of flat plastic weighted with plant weights is cheaper than slate or other stone, and you can bend it and drape it over things etc).
I say a thin layer of riccia because the mass beneath the top will rot away without light anyway, I'm sure you know.
I put a few pieces in last week and it is growing nicely through the net.
I am by no means an expert, but after trying what all the sites suggest regarding cotton and stone, I have found plastic net, fishing line, plastic (from desert pots etc) and plant weights to be a great solution for me.