Ok make a NEW LAYER, name it Shading. Go to SELECTIONS, Load from ALPHA CHANNEL, click the channel you had just created. Go to SELECTIONS again INVERT then go to EFFECTS, 3D effects, DROP SHADOW and use these settings. I used #38A09F for the shade color. This depends on what color scheme your using..
OHHHHH, I almost forgot..your lil fish tube...Copy & Paste it onto new layer..You will have to resize it. use these settings for that. 85% of original size.
Time to put a drop shadow on your words. Make sure the NAME layer is selected on the palette box. Use these settings.Also apply a drop shadow to each one of the tubes.. and While your at it place your tubes to where you want them in your picture.

Hide all the layers except the tube layers now. MERGE, MERGE VISIBLE.
This is longgg tutorial...
*Page Two*