It wouldn't be the fertilizer, it would be the indoor environment. But: the currently green plant you are growing doesn't have quite the same leaf shape as in the picture of the other red one. So, the question becomes are these two really the same variety?

Otherwise - as you may be alluding to - it has been written that 'Ruby Star' and 'Beni hoshi' appear to be the same. And that an English equivalent to the Japanese beni hoshi is "red star". If someone like Buchholz has a block of one and a block of the other - and they can be told apart - then one of the possibilities that comes to mind is something like 'Ruby Star' being a redder form derived from 'Beni hoshi', hence "ruby" instead of "red". If instead 'Ruby Star' is an unrelated form of completely independent origin then it is somewhat unfortunate that 'Ruby Star' and "red star" are such similar combinations of words.

Thanks for your comment Embothrium, I'm left scratching my head and wishing I would have snapped that photo last year, it really was a dead ringer for online photos of 'Ruby Stars'. Though, there's the definite possibillity of being a different variety, something similar enough at the time of shipment to pass off as 'Ruby Stars'. The plant was embarrassingly expensive, though I was stuck on having it, lol. But, before I go and accuse the nursey of a bait and switch, I note it is now transitioning into a coppery red color and interesting where it goes with that. All in all, I'm more curious than anything and love it or what it is and its coverage of small beautifully shaped foliage.

Hello Frozebud, I wanted to follow up and ask you how the Rubystar (Beni Hoshi) turned out to be for you. You have had few springs since you wrote this post. I am considering acquiring a 3 gallon pot of the same from an online nursery. Pictures on internet look very good but often the reality is different.

Hi AJ, honestly, I've rather have lost interest in it, as despite feeding it sparingly, it mostly wants to be green leafed. It's now just waking up .... maybe, I'll soon repot and totally forgo any feedings, possibly the love shall then return! :)