The blue star polyps will spread very fast when your NO3 is above 10 ppm(Measure using Red Sea NO3 test kit)
I use to have them all over the LR in my 5 footer.
They will disappear once your NO3 drop to zero
Please note this is my observation.
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Should be more then enough. Almost zero maintenace except to ensure the calcium mix is here for dosing.
Most bro mix and store in jelly can of different size
Your MG is a bit on the low side.
Watch out your KH.
Do not let it move by more then 1 in a single day.
So continous dosing daily is better then dose all at one time.
Use a dosing unit or kalk reactor to achieve constant reading
Your stand is weak in the centre. Base on the tank size You should need another 2 supports
in the centre.
the stand warp in the centre cause the base of your tank to crack.
Be careful next time when you purchase tank bigger than 2 ft.
A light meter will give you lux reading .
A PAR meter is more accurate which give you the PAR
reading for photosythesis.
But it is very exp as compare to a lux meter.
So the cheapest is to trust the spec from the manufacturer
or review other user feedback
Switch to led more then 2 years ago.
SPS and LPS doing fine.
In fact with good husbandry my purple SPS start to color up.
No issue.
Algae happen on all type of light.
Make sure your PO4 and N03 is zero or near zero.
Keep a clean crew to help to check your algae