Echinodorus species identification

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I’ve moved 4 emersed E. cordifolius plantlets to the planted tank and find out they have grown out these red leaves. Is this a defficiency leaves or they are turning into submerged form. Is it possible that they turn red cause of CO2?

@Colin_T @Byron
 

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CO2 shouldn't make leaves turn red.

It is most likely the new leaves are red and will go green as they mature. Or the plants have a red leaf gene that causes some of the leaves to go red instead of green.

Monitor them and see how they go over the next few months.
 
CO2 shouldn't make leaves turn red.
These Helanthium tenellum also turn red. Is it possible for osmocote fertilizer (yep, Osmocote burried in the substrate)
to turn it red? Maybe lighting?
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The osmocote should not be used in an aquarium substrate for submersed plants. There is way too much nitrate (which these plants cannot utilize when growing submersed), phosphorus and probably iron. I am not saying this is the cause of the red leaves, just pointing out the danger. If grown permanently emersed, that would be a different issue and the osmocote would presumably be OK as terrestrial plants use nitrate not ammonium for their nitrogen.

Many species of Echinodorus sprout reddish leaves which turn green, or remain reddish, or develop reddish blotches--all depending upon the species, and the growing conditions. I would leave these and see what develops. Every new leaf my E. major grows looks like it is dead, but it turns green as it grows.
 
Everythings seems to turn back to green after stop injecting CO2.
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