Usually Power compact fixtures have two bulbs
. A dual-bulb PC setup on a shallow tank like a 20 long is great for growing just about anything a beginner can tackle. I'd stay away from SPS, nems and clams, but anything else should be fair game.
So you've allready got tank and lighting with a budget of $300-400, this is a piece of cake
Since you're still in highschool and may not be keeping this tank for years and years, I'll just suggest some simple hardware. There are better alternatives, but unless you want to get really serious about reefkeeping, I woulsnt concern yourself with them.
20-30lbs of LR per gallon, try to find some locally from a reefer breaking down his/her tank as its way cheaper. If not, consider purchasing online from somewhere like liveaquaria.com, premiumacquatics.com or pretty much any other online LR supplier. You can sometimes save a good chunk of change if your LFS charges a lot for LR by either or those methods, sometimes not. Compare prices
2 -
Maxijet 900 powerheads for flowrate
1 -
75watt Jager Heater
1 -
Saltwater Master Test kit for pH, ammonia, nitrite, nitrate
1 -
Alkalinity Test Kit
1 -
Calcium Test Kit
1 -
Small HOB filter with bio and carbon pads removed
1 -
Bag of Rowaphos to go in the HOB filter (trust me, you want to stop hair algae before it even thinks of starting)
1 - Bag or bucket of salt mix (purchased from LFS usually cheaper than shipping)
1 - 20lb bag of aragonite sand (again purchased from LFS)
RO water purchased from LFS assuming you dont plan on keeping the tank your whole life. If you do, purchase an RO unit off ebay
Livestock and food
Thats around $200 in hardware, anywhere from $60-$150 for LR, and whatever extra you want for livestock. Totally do-able