Wow--I just discovered this thread.
I have a Spec III, two Spec Vs, and an Edge. I love them all.
I'll post the Edge as it's the newest tank and waiting for a gold hmpk from Thailand who gets here Wed.
I've tried slightly different mods with my different tanks. I've swapped out the charcoal cartridge for Purigen in all the tanks. I've got slightly hard water, so I have frog moss pads in the tops of all the filters as well. That actually dampens the flow from the head a bit and I also stuff some foam into it to dampen it a bit more. The Edge has an HOB so I've been experimenting with a bigger frog moss pad in a bag that's fixed into the spout to cut the flow a bit.
I've got two bare bottoms, one with white sand and caribsea substrate in the edge.
I haven't read through the entire thread, but will read it in bits and pieces to see what you all are doing with your tanks!
Here's the Edge and the new guy who's moving in soon.