how many fish per gallon in my tank? (130 gal)
 

how many fish can i have in my 130 gal aquarium with 2 inches of LS across the bottom and 100 pounds of LR?

The question you asked isn't detailed enough to give you an answer. That's like asking how many live rocks in 100 lbs? Well, there could be one big rock, or there could be 1000 little rocks. Your best bet is to pick out say 5 or 6 fish that you really really want, list them on here, and we can help you decide if they will suit your tank, then you can start picking species that will coexist well with the first 5 or 6, plus it will give us an idea of your "taste". Is it a reef or a FOWLR?