Maxima Clam flow direction?

[zsxking]

So I have my clam for about a month. It's doing good I think, open normally and response to shadow. But what concerns me is that it has not yet attached on the rock. It keep moving little bit every day and falling to its side every couple days. I have been putting it towards the flow, so the flow will go from its inccurent siphon (the open hole one) to its outcurrent siphon (the tube like one). I though it should be that way as water generally flow through it. Until several days ago, I decided to turn it 180. To my surprise, it didn't move a bit ever since then. So it looks like the clam prefer to pump water through its gill in opposite direction of the surrounding flow.

 

Is it generally the case? What flow direction does your clam prefer?

[tetraodon]

clams dont care about flow, generally, check for pests around its foot. give us more info on the tank and pics can help as well

[JavaJacketOC]

If it's in a high flow area, it's going to try and move.

[IronChefItaly]

There's surprisingly very little information out there for clam placement. The most useful things I've read include...

- the flow should not cause the mantle to ripple in the current

- they should be placed on a rock such that the surface cradles the clam but does not inhibit it from opening

- the clam should lie as flat as possible on its base aka byssal opening

 

Bottom line is if a clam doesn't like its spot it will not securely attach so you'll either have to move it or tweak your flow. I tried to secure my maxima on a larger frag plug and placed it within a region with too much flow and it would attach then fall over every few days. I moved it to a lower rock and it danced and pulled itself along for a week or two until it found it's perfect position - which was a few inches further and at a different orientation than I had placed it myself.