Help with algae ID 2 year old tank

[KingAh123]

Hi

Seen small patches of green/brown algae in few spots in my tank what is it should I be worried?

 

[FOO-CAT]

I wouldn't worry yet, but I would check phosphate, nitrate levels. look into things like maintenance, feeding and nutrient export routines and see if one or all need some adjustments. cleanup crew may need a few additions?

 

[KingAh123]

I wouldn't worry yet, but I would check phosphate, nitrate levels. look into things like maintenance, feeding and nutrient export routines and see if one or all need some adjustments. cleanup crew may need a few additions?

Do you know what type algae it is?

I have 3 hermits, 15-17 astrea snails, 8 Trochus snails, 1 conch, 8 nassarius snails, 2 shrimp, 2 Tangs, healthy population of pods and amphipods and an urchin.
Been thinking about adding 2 more urchins since the one I have, have been decimating algae on rocks for months. And more Trochus snails. My tank is a 375 liter 150x50x50 cm.

Just did a test my nitrates looks the same as they have been the past year which is at 2 ppm. My phosphate have been at 0.03 ppm but I did try to elevate it by feeding more since I want more coral growth. I got more coral growth like my zoas has been growing crazy, and my frogspawn has gotten 9 more brand-new heads. But I can see that my phosphates are below 0.03 now, might be because of the algae.

I could feed less, but I want to elevate my phosphates to see coral growth. What should I do? Just add more clean up crew?