Anybody ever try,umm, say a smelt on the bottum and a kwik fish above

is this legal,and how would ya go about riggin it?last year I slid a spin glow down my line while sturgeon fishing and had a nice swim by,I figure it was a springer,but have no proof to back up the rumor,the smelt was untouched though.I wasn't anchored in the springer spot I wanted to be do to a valve that decided to snap off destroying a piston and nocking a hole in my head,but figured I may pick up a gator where I was while I waited for a tow,as a second thought I slid the spin glow down and about 5 min later had a nice take down,but like I said nothin to show for it, but the idea of combo fishing for different species got me thinking.