I was lucky enough to get this plant a little over a year ago from a well known hobbyist here in Canada. When I first got the plant it only had two small leaves on it and took roughly 4-5 months to adapt and start forming a new leaf. I unfortunately had to move a short while later so it never had a chance to fully get established, nor did it enjoy the water parameters it was in (very hard water PH 8.2+). After I moved the water parameters which much more favourable (PH 7.5) but with the addition of pressurized CO2 I’ve been able to bring the PH to a stable 6.5. This is where I’ve found the Cordata ‘Rosanervig’ is happiest and has sent 4 runners for me in the last 6 months and roughly 1 new leaf every two weeks/three weeks. It was not easy to figure out exactly what the Cordata Rosanervig preferred but with much patience and experimentation I believe I’ve found it’s ideal conditions.

I’ve done many experiments with substrates, lighting, water parameters, and fertilizing and this is what I’ve found.

1st attempt  (FAILURE)
– PH 8.2 (Water was too hard)
– MGOCPS with silica sand cap (Anaerobic conditions formed and the plant was not happy)
– Tank was near a window (Plant does not enjoy high lighting)
– Excess lighting+nutrients caused algae to form and veins to disappear.

 
2nd attempt (SUCCESS)
-PH 6.5 (Nice and soft)
– MTS+Dolomite+Muriate of Potash+Natural Clay + Seachem Flourite Dark X 1, Red X 1, Black Sand X 2.
– E.I dosing, micro + macro nutrients
– Pressurized CO2 10PSI 4 BPS
– T5HO light with PAR between 20-30. LOW LIGHT IS NECESSARY FOR VEINS TO DISPLAY.