Clams tank

[bwilly]

I do remember reading somewhere (dunno which of my books or online) the siphon is use for makan food.

http://www.webbscrabshack.com/buy_on-line_f.a.q..html

What purpose does a clam's siphon serve?

Three main purposes: breathing, obtaining food, and eliminating waste products. Since clams are relatively immobile and movement is usually limited to burrowing in the sand, their double-tubed siphon—which operates much like a snorkel—is their lifeline. Inflowing water is pumped through the siphon, passed over the gills, and strained to remove food particles. After receiving carbon dioxide from the gills and other waste products from the digestive tract, the water is expelled through the outgoing siphon. Constant circulation of the water is maintained by the beating of a multitude of microscopic hairs (called cilia) located inside the tube and in the gill chamber.

[Dispar_Anthias]

Actually open abit wide still okay IMO...but the mantle start to stretch upwards the sign is obvious...

That depends on what species you got, crocea and derasa tend to have their mantle open wider than others... So to really know whther they are in need for light , you have to see what species you got and what lighting you really using.