How can I get more blue lights on my RSM130 with PC

[jhj0112]

I have had a RSM 130 with stock lighting for almost a year. I really love the tank except it is too white with the stock lighting.

I understand there is LED option for this but I'm bit hesitant to get it because I want to upgrade this to RSM 250 in future.

so how can I achieve more blue lighting without installing LED?? will there be another(non rsm stock bulbs) PC bulbs (actinic) that I can put in RSM 130?