I personally would have either a coral+, AB special, uvl actinic white, or a uvl 75.25 bulb to avoid the washed out blue look that you would get by using all B+ bulbs...
Also, want to mention that while the look of the purple plus bulbs is very appealing to the eye, I've heard(from a very experienced reefer in our local club) that they can negatively affect the colors of sps/lps and am myself going to change out the one purp+ bulb in my arrangement to something else.
Maybe having your entire fixture full of ATI purple bulbs could have some negative affects on color, but not a single bulb on a 4 bulb fixture. The reason they could potentially negatively affect color is the big, isolated spike at ~620nm and large amounts of red/orange light may be potentially negative to corals. However, almost all of the other ATI bulbs have peaks at this range (especially the coral+) anyway, so it isn't just purple bulbs and almost every fixture of any kind on the market has spikes around here as well.
Yes, it is a poor choice to have a large portion of your PAR coming from orange-red wavelengths, but having some orange/red is natural and isn't going to be a problem at all. This is especially true for the OP since Blue+ has almost nothing above 500nm so a single bulb with some orange light is going to be a benefit since it will round out some of the missing spectrum.
The idea that purple bulbs have something that is "bad" for your reef is bunk. Sure, having a poor mix of bulbs that causes high intensities at the wrong spectrum will be bad, but there is nothing special about purple bulbs at all.
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