I would not worry too much about algae or detrimus unless it is smothering you Red Chili. I got mine about 10 months ago and did not know what I had as the store clerk told me it was a "soft" coral. I later found out and researched the Red Chili Coral. I think it is a coral which would be happiest growing sideways on a reef slope with some light.
I tried making a cave for my Red Chili with the Chili facing down from the roof. It never really took off with this situation. The Chili then fell from the roof and fortunately feel upright where it grew into a blob until I took down the cave to make room for my six Lobed Brain corals.
Now there it was back in the front left end of the tank in the substrate. I received three Lobed Brain corals last night from Dr. F & S and after I had them in the tank I added my weekly dosing of Kent Marine Strontium and Molybdenum, Iodide, and Essential Elements supplements. The Chili coral rose its branches up somewhat after the timer controlled lights went out at 10:00 pm.
Lo and behold, I woke the next day at 6:00 am and looked into my tank with the LED night lights on and saw that my Red Cactus Chili Coral had risen up from the slump and was proudly showing its branch's full lengths with white snow flake polyps. I have been target feeding my Red Chili Coral daily along with my green and red gonioporas.
The previous day it was starting to be covered with some green algae. I suppose you could use a soft tooth brush and gently brush the algae.
I am going to let nature take its course. My Chili will stay in the left front bottom of the tank unless or until there is a need to move it.
The Red Chili is directly under 5 1/3 watts per gallon of CFs and maybe this corresponds to what day light would reach farther down from the surface on a reef slope where it is dimmer?