hi and welcome!
It's a fun hobby, isn't it!
Sounds like you're getting some excellent advice. I just had a few thoughts to add:
Brown algae is really common in new tanks...Once the tank is well-established, the levels die off a lot. Fortunately it's easy to brush off...I just go in with a brush before the weekly water change and dust everything off.
Overfeeding is a big contributor to algae. Make sure you're not overindulging the little piggies. They are *so* good at pretending they haven't eaten for a week!
I still have the original carbon filterpads in my Emperor filter, along with an extra filter basket with regular floss. The carbon quits working after about a month, but regular water changes do a better job for the same purpose anyway.....I have never bought new carbon. I just replace the floss in the other basket when it gets so old that it isn't filtering right anymore.
Make sure when you rinse the floss or carbon filter thing that you do so in tank water (maybe collected in a bucket during a regular water change) and NOT in tap water, so you don't kill the good bacteria.
Even when your cycle is complete, I recommend adding new fish gradually rather than all at once. Whenever you add to the bioload you create a new little cycle, and adding slowly lets the bacteria catch up.
Also, if you add a new fish gradually, it's easier to monitor everyone's health, and you run less risk of infecting everyone. Think about a quarantine tank for new additions....Nothing is worse than getting the cycle right, only to find that a sick newcomer ends up killing everyone.
Good luck! Welcome to the cult....er, hobby.