I've had a few frags like that and they're kinda funny. I found mine to be very picky in EXACTLY where it is. I have a new one similar to that that I literally had to put under my giant Milli where it gets less light but in such a way that it gets a ridiculous amount of flow. Within days of being there it colored right up and started growing.
Aside from that, I have to agree with the Mg idea.
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