New bulbs coming today!

[catfisher]

My new T5HO bulbs are arriving today :beer:. Do I need to replace only 2 at a time or can I replace them all at once. The only coral I'm concerned about is a frogspawn, galaxia, and hammer which are all mid-level in a 55 Gal. I also have a Red Lobo and orange blast acan on the bottom along with a crapload of zoanthids and Palys all over the tank. The new bulbs consist of of 2 ATI Blue +, a UVL Actinic White, and an ATI Actinic...

[layer3switchguy]

I've never replaced them 2 at a time in my SPS tank, and would just replace all 8 bulbs at once on my Powermodule... But if your worried, replace them all and raise your fixture for a bit and reduce the photo period by an hour.

The bulbs you have shouldn't cause an issue if you replace all at once.