Newbie starting out

[nemobestie23]

I’m trying to get all the info on what to do with my new tank.
Everything balances.

Nitrate/nitrite I been fighting with strips keep telling me a light pink for ok/stress
Salinity is good 1.025-1.024
Alkaline sand Ph balanced

I have a clown fish in there doing really well. I have live rock. Bubbler and filter.

Is there anything that I should be doing to be able to add new fish or anemone?
What is pros and cons of a 5.5 gallon tank?
Should it be 10 gallon or should I get by like this?

Need all your tips and tricks!

 

[1112-425XL]

Age of tank, tank parameters, lighting and pics could be helpful.

 

[C4ctus99]

5.5 is very small and will limit what you can keep in it, just so you’re aware. Chasing numbers has not been my thing, keeping nitrates below 40 is usually good, but most people target 10-20. You may have to do water changes regularly to keep things stable