I will say that the first half of the thread is flaming against the tang and OP. Sorry
@Alexx17 that you walked into that landmine. Sometimes we all just need to relax a bit and help others rather than thinking "wow they are really ....., save the Tang!" We were all there once (and for some of us this period lasted longer than others) I do believe from the posts that he is trying to set up a tank as best he can, might be getting bad advice from the LFS, and is 18. No offense, but we all have had bad advice from an LFS, and most of us were 18 at some point. Now I am old enough that most of my friends have kids who are 18. For a fact: 18 year olds don't believe anything they didn't think up. They are head strong because of their place in life. I get it. You get it. They don't. They can't until they are older. That's being 18 and one day they will understand, and until that day they will think myself, and many others, are wrong. Maybe we are.
But Alexx, the advice here is genuine. We say things like "get rid of two fish that were really expensive and you love" because we have been there. Its not fun to see your fish bullied and ripped apart (literally) by other fish you love. Fish are mean little buggers in a beautiful but very fragile armor. They die easily. If you think you might have a life long love of reefing then go the easy route for now. Get easy fish, don't overstock, do weekly water changes, and listen when a lot of people give you the same advice.

Cheers. Your tank looks great and you are OK to ask questions here. We all really do want to help. Sorry again about your bad start into these forums, forums are actually helpful in this hard expensive hobby.
....and have patience..... LOTS of it.....
patience is the hardest part of the hobby
its not logical why things happen for good or bad is the second hardest part of the hobby