Slow growing?

hey all, just curious to how slow everyones fish really grow, I have had my setup now for about a year, with the fish:
2 clown loaches
2 silver dollars
2 giant danios
1 green severum
1 BGK

all fish have gotten big over the year, BUT my loaches seem to be the same 3.5" since the day I bought them and the BGK well I don't know about him, but he might have gotten an inch if that

Now I have read that clown loaches were slow growing, how slow we talking about? Anyone out there wondering too?

I have a 72g, they have the most wierdest interactions some times, I can sit and watch them forever, the clown loaches some time swim right along the silver dollars and act like a sea lamprey minus the pasitic affect. and they love to dig! But ya I was just curious about their slow growth