First time salt questions

[Bob I]

Originally Posted by reeferaddict

Actinics IMO are the KEY to successfully keeping corals. SPS growing near the surface may be the exception, but anything a few feet deep require light in the 420 nm range for their symbiotic algae to photosynthesize. Coralline algae DEFINITELY need it.

Just how difficult is it to understand that full spectrum light near the surface contains ALL the wavelenths. Deeper down some wavelengths are filtered out leaving only the blues.

Therefore one does not "need" actinics if one is supplying full spectrum lighting., simply because we are already supplying the 420nm light. It is purely for aesthetics that we use actinics.

I fully realise this is a rehash of stuff we have gone through time and time again. However, it seems that it bears repeating.