Questions - Need some input

I am shutting down my reef tank. I put a lot of thought into the decision and feel it is time. My question to ask is am I allowed to use this site to help me unload what I have ?

i need some advice, today as I was doing my water change I droped a piece of eggcrate that had a frag someone gave me right into the L T A.
I was not able to see where it went at first, then a few hours later I was able to see a section of white sticking out of the mouth.
what if any can i do

I am looking for some help with my 65 gal, 3 year old tank. over the last few months some of my mushroom died now some of the zoos seem to be struggling. i know what I did yesterday will not help over night but I just changed all bulbs (pc's 96 w) replaced all RO/DI filters. here are my latest #'s calcium 500 I know it is high spilled some when I added
nitrate \ ammo 0
p h 8.0
alk 2.6
mag 1050 this is the first time I ever tested this
salinty 0.22
temp 76 ...

i just found this on my fish what could it be, sorry not the best pics.

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I want to know if someone has a solution to help remove any excess silicone (not a razor blade). I had to take apart my sump because I used the wrong silicone. I have scraped off what I can, know i was looking to get glass & tank cleaned the best I can so I can reglue it back together.