Water flow in my refugium ?

[Gee]

I just finished my fuge, i did a little test with a hair algae, i let the pump suck it to the fuge and watch the water flow in the fuge, my concern is that it didnt go down where the sand is, it floated to the last chamber and went back in the tank, do you think the water will mix correctly ? is there some kind of water colorant i can add the the intake to really watch the flow ?

The water is perfectly balance even if i cut off the power,the water level only raise about a 1/4 inch but should i add i check valve to prevent a siphon effect ?

Thanks for the help, my fuge was inspired from reefer, but because i work for a glass manufacture i build it with glass.

The fuge hold 5 gallon of water.

Here is a pic.

http://www.nano-reef.com/forums/attachment.php?s=&postid=221886

[Gee]

here is the testing :

http://www.nano-reef.com/forums/attachment.php?s=&postid=221888

[mogurnda]

It looks pretty good. I think I would have made the baffle on the intake side a bit lower, just high enough for the sand bed, but it's probably too late to do anything about that.

I have the CPR Aquafuge, and decided to turn the outflow siphon into an overflow. I was worried about loss of siphon, and consequent flooding. Few people have complained about that, though.