I believe you are those who add a few plants to a tank with fish just to beautify it? Well, if that is the case...I assume you have not added base fertilizer which is quite essential for echinodorus as they are heavy root feeders. What you need to do is to try to get those root monsters stuff or laterite balls in lfs and push it deep in the substrate near the plant so that no fert would seep into your water column and cause algae boom...CO2 is neccessary and you need to know the relationship between pH/KH before attempting to use it as over injecting it could cause possible death to your fishes......read the following website to find out more...http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm
Plant Physiology by Taiz and Zeiger
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