Blennymower

I recently got a hammer coral frag. It has two heads, and the polyps are always extended. However, I'm noticing the tissue starting to recede at the edges little by little. I've tested water parameters and all seems good, and I'm also doing regular water changes. It's under a 250watt 14K bulb.

Any ideas?

I added a couple of things

First, new bulb (notice I need another light on the other side of the tank)





My LFS had this macro-algae for $2 and it looked really nice, so I thought it would make a great addition to the DT. I don't know why such algae aren't more common in reef tanks, it ...

Went to do a little maintenance and bam! I Found one of my little buddies dead and dry on the floor




He belong to a school of four (now three). He was the biggest, and here you can see he was really nice and fat


...

I went from MHs to T5s and back to MHs!

Icecap 175/250/400 Pendant
Icecap 250 Ballast

I'm going to need a second set for the other half of the tank, but boy is it good to have MHs again




...

I'm undecided on what type of bulb to use.

HQI DE or Mogul SE?

I've read that HQI DE give off less heat and are more intense, true?

Which do you use and why do you think it's better?

Thank You.