You need to get test kits for Calcium and alkilinity. Test the water and if your cal is under 400 then you should add some and I like to keep my
alk around 10.5.
Without these addidtives
IMO it will not spread. I add B-ionic 2 part system and it has worked wonders for my 125 reef and I have added some to my 55
fowlr just to get it started and it is all over the
LR in that tank also not so much on the glass which is fine for me in my
fowlr. I check my 55 every few months and add some
alk if needed because I use ocieanic salt ant the cal levels are high so no need to add that. I dose
alk to my 125 daily to keep it growing and the corals use it also. Lighting
IMO is not that big of an issue seeing as I only have 80 watts
NO light on my 55. good luck...