Blue Scroll is probably my favorite in the brown algae category. The ripples of blue sprouting randomly out of rocks bring beautiful color and character to a display. This algae is lightly calcified and an owner should test calcium to ensure the supply is keeping up with demand. If you begin to notice that calcium is being used up quickly between water changes, a calcium supplement (or a 2 part dosing system) can be helpful.
Scroll will grow in many different lighting and flow combinations, but blue scroll has grown best for me in lower light, towards the bottom of the tank. If you ordered blue scroll from a vendor, and it’s not very “blue”, you likely received Padina instead of scroll. Padina is also very pretty, but typically doesn’t have the shimmer and deep color or scroll. Another clue is if the algae does not seem very happy in the lower lighting. Padina requires very high lighting and should be placed at the top of an aquarium. If you can’t tell which algae you have, try both situations.