CF_
That tanks looking nice!
Your tank just needs to mature a bit more it seems. Water quality is EVERYTHING in this hobby. Even above light requirements Water Quality is the most important. That being said TIME is also just as important. Patience is necessary so that the water quality doesn't diminish due to adding too many fish or corals at one time.
I can't believe no one told you about anemones. The bulb anemone you have is one of the easiest to care for and they are generally hardy but they don't really belong in a tank that is less than 6 months old. The reason for this is the tank hasn't Matured before that time. Which means you will have fluctuating water parameters etc...
Water from the LFS is best to use if they use RO/DI (reverse osmosis/DeIonized) water then yes get it from them. If they just chemically neutralize chlorine or ammonia then add salt, forget it. You can do the same thing yourself.
Also, what are you using for your chemical filtration? Carbon, phosphate removers, resins like chemi-pure are very good to help keep water conditions favorable. I personally use, Purigen (a resin by SeaChem), Chemi-Pure (another resin product), SeaGel (carbon and phosphate remover combined). I use all 3 items in seperate filter bags. I change the Seagel out every 2-3 weeks and the resins I change out every 3-4 months only I change 1 or the other and wait a month to replace the other one.
Chemi-Clean is a very good product for getting rid of the Cyano algae. Make sure to follow the directions to the letter... I have used it before so, I can attest to the performance of it. Also, this is better to use than an antibiotic, because the tank won't become resistant to it as it would with e-mycin.
Just be patient and you will see that tank of yours develop into your dream.
HTH,
TB