New Reefer looking for advice.

Greetings from down South,

I am new to The Reef Tank and to reef keeping in general. My tank is only about 3 months old and I've finally gotten past the green hair algae! I've made a lot of mistakes along the way and once I began actively googling every question I had I realized that most of the best information I found came from this forum. So I decided to join and post a few questions.



First here's my setup:



Equipment:

47 gallon column tank

HOB filter with 2 replaceable carbon filter cartridges

SeaClone 100 protein skimmer

LED light as well as 1 T-5 Actinic

Crushed Coral Substrate

15 pounds live rock and 15 pounds white coral rock



Livestock:

1 Pulsing Xenia (Heteroxenia)

1 Neon Green Tree Coral (Nephthea)

1 Montipora Digitata

1 Green Open Brain Coral

1 colony of Green Button Polyps

1 Hawaiian Feather Duster Worm

1 True Percula Clown Fish

1 Ocellaris Clown Fish

5 Astrea snails

1 red tipped Hermit

2 peppermint shrimp



Maintenance routine:

10% weekly water changes

Change filter cartridges weekly

Dose:

1 tsp Vodka every morning

15 drops Kent PolyOx every morning

2 tsp Iodine every morning

1 tsp Kent Purple Tech every night if Kh is 10 or below



Parameters:

Nitrates below 5ppm

Kh 10

Temp 78-80 degrees



Questions:

1. I began adding the PolyOx 3 weeks ago when my Green Button Polyps began to close up and melt away with a section about the size of a quarter completely dying off. Took a pic to my LFS and was told it was probably DOC's and to begin adding PolyOx along with the vodka that they had previously recommended. He also recommended dosing the Iodine. Since making these changes as well as adding the T-5 Actinic light my Green Button Polyps look better than ever and the area of die-off has grown back. So do I continue the PolyOx? Is this something that's meant to be used long term?



2. Since adding the T-5 Actinic light my Xenia has begun producing a lot of slime. It hadn't done that before. The Xenia has climbed to the highest rock in the tank and seems to love the light but I'm wondering if the slime is a sign of distress or too much light? He has attached himself to this top rock so I can't move him. If it's too much light will he move lower just like he moved himself up there?



3. Should I be adding microplankton filter feeder foods for the Hawaiian Feather Duster worm? I've had him about a month and he seems to be doing fine but I'm not sure if I should be feeding him or if the contents of the tank are sufficient. I've also read that although all of my corals are photosynthetic they could also benefit from microplankton filter feeder foods. Should I start adding these or leave well enough alone since they seem ok now?



4. Finally coral compatibility: The top rock in my tank contains the Xenia (who put himself there), the Green Tree Coral (which has grown noticeably in the few weeks I've had him so seems quite happy where he's at), and the newest addition the Montipora Digitata which is a small frag that I just purchased last weekend. I've read that soft corals like the xenia could possibly inhibit the growth of stony corals and I'm wondering if the placement of the xenia and the montipora digitata is a problem? They have plenty of room to grow on the rock and are spaced well for now. I know both are labeled as "peaceful" but I just want to make sure they can coexist happily.



Thanks for any advice you may have!