so my rose BTA (might be a rainbow since it's got green, red, and some pink/purple on the tips) has lost some of it's vivid coloring from when i first got it. it's turned more to a tan-red and i was wondering if there was any way to reverse this to get the coloring back. it's very healthy and actually split a month ago, both are doing very well...except for the coloring of course! any advice/help would be much appreciated, thanks!