What to do add ?

[Notsolostfish]

Its my first sump. Its 18 gallons for 36 gallon displaym currently tank is cycling with rocks and sand. I have the sponge that came with the sump. And i have nyos 120 waiting for the cycle to be over to use it later on. And i have the sock. What other things i have to be aware of or add to sump? Marine blocks? Bio balls? I have a refugim setup too.

 

[Waters]

I wouldn't add anything......I am sure it is in there already but I don't see your heater?

 

[Notsolostfish]

I wouldn't add anything......I am sure it is in there already but I don't see your heater?

Oh i have the helios. Its at the back