Clean Up Crew that is Effective with Rockscapes

[Validator]

I have quite a bit of detritus settling on the rockscape.  I have snails moving around cleaning the walls but I would like to get something that works well with the upper half of the rockscape.  Any suggestions?

[dtdream]

What snails you have? Trochus are effective but maybe you need smaller sized ones to get in between the smaller spaces. 

Alternatively increase your flow. Random flow helps to get detritus off. 

[Validator]

I was trying to find a random flow generator nozzle for my outlets but can't seem to find.  Do you know where I might get one?