oh, i see, since you already added the fish, then whats done can't be undone... cory are hard to resist...haha
3.5wpg should be enough,you check your tank capacity using the calculator links; if your tank is 60 x 30 x 45, your are having only 2.57wpg which may not be enough... i am using 4 x 24w for carpeting my microsword in my 2 feet tank... SP Power likes me very much...LOL..by the way, are the light tubes new??
whats your co2 level? for now, don't worry too much about HC as its quite hard to judge HC growth now...it takes approximately 2 weeks for it to convert grow properly, change the light regime to 6-8 hours straight, lights need to be at least 4 hours straight to be effective. Monitor it and see hows the condition. if you want easy carpeting plant and willing to spend more time waiting, microswords is a great choice as a beginner carpeting plant...

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