Newbie here with some questions about my cycling tank

[Sumfingwong]

Just a small update.

Ammonia 0
Nitrite 0
Nitrate 20

So..I am still waiting for the ammonia spike, but every time I test the water, its 0.

I am currently prepping some water for a small water change, to lower the nitrate levels. If the nitrate levels continue to rise.. does it mean my tank is cycled?

My skimmer is pulling in some brown gunky stuff every time i throw some flake food into the tank for the hermit crabs and snails