I've got a xr15 gen4 over my little tank and I'm putting up my 93 cube , the xr15 says it can cover 24"x24" my new tank is 30"x30" could I get away with hanging it a little higher and ramping up the power or could I change the lenses or should I just look at the xr30 , I'd rather not spend more $ if possible but with this hobby I don't even know how that's possible.