I use the Digital Macro, zoomed all the way, camera against the glass. The Clams are attached by themselves, in the first week after I got them. I placed them on the rock of my choice, facing up so they can't fall off, after a few weeks they were on there solid. Then I just tilted the rock so they're facing more forward, syphon pointing up. I found that if they like the spot (lighting&flow) they will stay firmly attached, if I move them somewhere they don't like, they'll detach and "jump" within a few days.
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