QUOTE(tehoice @ Jan 11 2016, 10:16 AM)
i reckon you need to dose some iron, in order to make the plant red....
Not really, unfortunately it's a myth. Iron is essential for all plants, but excessively dosing won't cause plant to become red. If you dig deeper into this how to make plant red topic, you'll be surprise by the result.
Based on my findings, here's how some people make the plant red:
1. Low nitrate - it's hard to control, need test kit and usually quite expensive. If not mistaken, by reducing nitrate will reduce the production of green pigment. But if it's not done carefully, it will affect other plants. That's why sometimes your red plants seems to be redder after WC.
2. Long hour of high light - Red color plants (and some green plants) possess red color pigment cells called Anthocyanin which serve as a "sunscreen protection" to prevent leaves damage when plant exposed to highlight. That's when you'll see your plant become red color. High light alone isn't enough, the photo period need to be lengthy enough to have the red pigments production.
Just recently, I switched my LED to 3 T5 24watt for my 60cm tank. I can see my rotala and ludwigia turn red day by day. But then, I have this Green dust algae bloom

Did a huge cleaninig and WC and followed by a 3 days blackout routine for the first time to get rid any sort of algae. Wish my luck
This post has been edited by artsyfarty: Jan 11 2016, 11:20 AM