But your tank is still too young for so many fish. You are almost at your max amount of fish considering that two of those fish are going to get huge (at least 6 inches in length).
How long did it take to cycle and when did you add these fish. Under normal conditions a tank that size would take at least a month, maybe two, to cycle completely. IMO
I am surprise that 10 lbs of crushed coral completely covers the bottom of your tank, but I suppose that in your case a bare bottim would be okay considering the triggers, eel and puffer are all messy eaters. I am not familiar with TetraTex, but I would be surprised if will be able to handle a tank that size. You will definitely need more live rock for added biological filtration, which ideally you are looking to need to add between 40 and 50 more pounds.
I am not sure on the lighting you have, but it is possible that your tank isn't ready for an anemone. From the sounds of it, your tank doesn't have enough current to support a gorgonian with just a HOB filter and a powerhead. Gorgonians need a good water flow to filter the water.
Also, you need to be careful with the fish you are mixing. Huma (Picasso) are aggressive and will likely pick on smaller fish as they grow, if not careful. Your Niger is more docile, and reef safe. If you are going to go with a FOWLR, you might want to reconsider adding any more inverts like cnidarians or crustaceans, for the trigger, puffer and eel will eventually make a meal of them all, especially as they age.
At this point you might not be able to add any more fish since blue devils are NOTORIOUS for killing it tank mates, large or small.