2 month update! Some questions

Hey guys! So after 2 months, I decidied to give you guys an update. I have a ton of what I believe are pineapple sponges, which is normal for new tanks, but they are everywhere! Ammonia and nitrite levels havent spiked at all and nitrates are around 20-30. Im planning on doing a 50% water change on my next day off next week. Any tips or advice? Coralline algea seems to be growing quite nicely!







-Residents-

Bi-Color Angel
Neon Damsel
Yellow-tail Damsel
Striped Damsel
Starry Blenny
Neon Goby
Pair of Osc. Clown fish (one black and white/other norm)
Spotted Manderin
Chromi
15 hermits