Cryptocoryne Cordata Var. Siamensis ‘Rosanervig’ Submersed

Cryptocoryne Cordata Var. Siamensis ‘Rosanervig’ is a very rare yet controversial plant due to it’s white/pink veining that no one has been able to put a thumb on. We do know that the veining is due to a virus, however the veining seems to either be very pronounced or not pronounced at all depending upon the set up they are in.

I have seen this species under high light conditions (60+ PAR) with it’s veining still present and very deep, while also seeing this species in another set up with med/high light where hardly any veining is pronounced.

For me personally I have only been able to get deep/rich white/pink veining to display under lower light conditions like you’ll see with this runner hidden behind a piece of driftwood…

IMG_1804 IMG_1805

HOWEVER; I also have a runner in the front of my tank where the light is MUCH brighter (60+ PAR) and you can clearly see a pronounced pink/white vein, although it is not as “thick” as the one hidden behind the driftwood.
IMG_1795 IMG_1794

This is a new leaf forming off the mother plant, the mother unfortunately does not have the greatest veining but the plant is an absolute monster at almost 18+ inches tall and constantly sending 10-15 runners every 6-8 months.
IMG_1798 IMG_1799 IMG_1800

Here are more runners, in total I have six runners currently popping up, all ranging in size from tiny plants just forming to daughters that have 2-3 leaves.

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As always here are the specs the plant is kept in:

PH- 7.4 at night, 6.5 during the day when CO2 is on.
Temperature- 74-76
Lighting- 30″ Dual bulb T5HO – 6700k and Rosette bulb (10 hours per day). 24″ Dual bulb T5HO – 6700k and Rosette bulb (8 hours per day)
Filtration- Marineland C220 Canister Filter
Substrate- Flourite Dark, Flourite Red, Flourite Black Sand, Muriate of Potash, Dolomite, Mineralized Top Soil, and Natural red clay from the earth.
Water Changes- X 1 a week 50%
Dosing- Alternate Micro and Macro ( 1 day Micro, 1 Day Macro, etc) KNO3, KH2PO4, KS2O4, and Plantex CSM+B.
CO2 – Dual Stage Concoa 212 with Parker H3l, Fabco Solenoid, bubble counter and 15LB CO2 Tank. 2 BPS via inline diffuser on canister outlet line.


  1. Great job reporting on your experimentation with this quirky variety. It appears you are making some progress. The question is what causes the “veination” to occur. Good luck.

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