Starting a 20gal

[skabooya]

So shopping list would be:
nova extreme 2x24 24" T5 HO fixture
25lbs LR (Fiji, Tonga, Jakarta, Vantau ? HELP i have no idea)
15lbs sand (Caribsea Aragamax Suger sand for a shallow sandbed)
2 Koralia 1's
1 hydrometer (i know refractometer is better but i cant afford one right now)
1 bucket of Instant ocean salt
I have a few heaters from previous fw setups so i will use one of them.
I will also invest in a glass lid to cut down on evaporation, stabalize temps, keep stuff from jumping out, keeping salt creep/spray to a minimum, and from stuff getting into the tank.


2 gal water change weekly or maybe biweekly? because i plan on having a low bioload (mostly inverts and 1 or 2 fish max)
Should i think about getting an HOB fuge with a skimmer attachment? Or maybe just a cheap skimmer.

Let me know how this sounds and if i am forgetting anything or if i should change anything.

Thank you in advance.