Questions - Need some input

Hey guys,

I have a picture to show all of you. The kind that an owner gets excited over. Water in the tank!! Here's my tank filled as high as I can currently fill it (the plumbing and overflow box aren't totally finished yet):

At the water's highest point I went ahead and measured the distance from the rim to the water line at all 4 corners. The right hand side of the tank is 1/4" lower than the left hand side of the tank (the ...

Here are some recent pics of some of my corals. My tank is mostly LPS with a couple of SPS, leathers, shrooms and zoo's

here's a lobo


here's the fungia, which has really gotten fat




some pink/green hammers




the orange monti cap, which measures about a foot across.


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For anyone who has not read any of my most recent posts (though most recent may still be a couple months old) I have been fighting with Caulerpa Toxifica and hair algae. I have done frequent water changes, water parameters check out good (with a test kit but I will hit on this subject again later), lighting is a few months old so still within spectrum, and I am close to hair falling out over the stress this is causing me lol. So now that everyone is caught up here is my thought process.
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For the past 2 months I have had the pest macroalgae, Briopsis, growing in my tank and it is starting to get really bad IMO. Now i know the only sure fire way to get rid of this stuff is to raise my magnesium levels to at least 1500 ppm. But I have an SPS dominated tank and raising the magnesium too fast or at all could kill them all off. However, I have nowhere to put them while raising the magnesium levels. So I have a 100 gallon tank and a 30 gallon sump and my question is how to raise my magnesium ...

I am wondering about my filter socks. I change 20 gallons of RODI water every 2 weeks and add supplewments weekly. Also I change out my filter socks weekly but they seem to get plugged by about day 6. My schedule was off this week and the socks got plugged and the water bypassed them and ran like that for about 4 days. The tank remained perfectly clear and I am wondering if the filter socks are really necessary. It seems ther would be more microscopic food available for the corals and feather dusters ...