Questions - Need some input

It's been forever since I've checked-in on Reef Addicts. I still don't see a 400g in Marc's living room? Did they ship via PAC MULE? Seems like a year ago? Need our fix.

I recall a thread somewhere here or from Drummer's Reef 180 build where someone mentioned that while using bio pellets they try to keep alkalinity near 8.0 dkh? Can't find the info. What was the thought behind that?

Thanks!

Am slowing learning what this animal needs to be happy.... For example,

Enough flow to support itself. In good flow now, as in low flow it seems to sag as if to heavy.

I've had it for few years and quite slow growing? Not sure why?

My question, note the right edge in the pic, it continues day after day to not quite extend tentacles/polyp thingy's. What is it saying?

Picked up a few Acropora SPS corals and want to know more about identification? Does anyone recognize and/or know the Id ? Perhaps origin waters? Seller didn't have this information.

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Those with experience having in-line refugium, please offer your thoughts. I have a refugium with miracle mud base plus few inches sand bed on top of that. Been running for three years. Content mainly consists of cheato macro algae,small pods, and quite a few of bristle worms... I've seen a you tube video of a cleanup crew farmer saying, small bristle worms of the kind in my refugium are good, just not a certain large type worm (forgot the name, 8+ inches long ... That's great.

So, ...