After buying some silver dollars a few weeks ago all my plants have been completely destroyed and the leaves have holes in them so I am done with live plants. Going back to fake as my tank looks a bit of a mess at the minute with all these damaged plants. Was thinking of going for a marine blue look to the tank just wondering if I will need 1 or 2 bulbs. I have the rio 400 with 2 bulbs which are the normal white ones. Now to get the marine blue look will I need to use one blue bulb or replace both and use 2?