OK,
I have no problems with GARF whatsoever other than this. There is no such thing as a bulletproof reef. If there was, forums like RF wouldn't even exist.
Let's think about this.
You have 2 125g tanks. One contains a 3 foot long snowflake moray eel with only only mushrooms and zooanthids. The other tank contains a relatively small bioload but is stacked from top to bottom with SPS corals, a couple clams, and maybe a few softies.
The calcium needs of the 2 tanks vary widely. The alkalinity needs of the 2 tanks vary widely. The nitrate problems of the two tanks vary widely.
If you treated both of these tanks the same based on Sally Jo's dosing "recipe" you are waiting for disaster. It's the "recipe" and word "bulletproof" that bother me.
Test, test, test. Do regular water changes with a quality water source and a quality salt. NEVER overfeed (it's tempting but there are more problems other than nitrates).
With that said, there are quite a few soft corals which will do just fine with that amount of lighting. Coralline algae will actually do VERY well with the lower lighting.
I don't use filters either. I use protein skimmers and live rock. Sometimes I use a sandbed and sometimes I don't. If you want to go with a DSB, do a search for Ron Shimek or Rob Toonen. Many people are preferring SSB's now (shallow sand beds). There are pro's and con's to each type of substrate.