Ok this is the second project where EZB will be used to control lighting , current flow , temp , salinity ect. This thread will show just about every step ot the build , electronics , wiring and eventually the scripts to make it work. 
- Josh Starnes
By jstarne1
— Last update
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I did add a few more pieces but I will probably wait for that update when the main light is back of running at 10 volts..
Initial cycling is doing great , I will post a update once I fix the main actinic light https://www.youtube.com/watch?v=t2PgMUmfpe4&feature=youtube_gdata_playerOk tiny update , I used a step down converter to lower the voltage to the leds , now the heat is low enough to touch but I still would love to run them between 11 volts and 12 volts to get max brightness. Total wattage will be about 32 watta between all daylight leds. Thats a huge savings over 40 watts worth of flouresent lighting.... well ok not huge but it looks good lol. I will test with a meter to check later , here is a before and after pic with additional leds.
Before
After
Im considering moving all the leds into the one center pod which will maximize shimmer effect but all the light will come from a 6 x6" square. With these two 60mm 12 volt fans they really push a great deal of air through the box. Im considering running it at 12 volt and see if my home made heatsink and fan combo can keep these crazy bright leds cool. Just one additional volt makes a huge difference in light ouput.... (and heat)Ok so I moved all the lights together onto the one module and now they are running 12 volts instead of 11 and are running like a champ. The additional side vents made with pattern drilling increased airflow and im using two fans in case one burns out I still have a backup keeping all the leds cool. It is low power , still less than an average single standard marine aquarium bulb.
I still need to wire 6 to 12 more blue 1/4 watt leds , three more whites , and a couple uv leds. I will be ready for another update picture then., tiny update - smaller wave makers are in the mail and I hope to have them by the weekend. Due to the smaller size of this tank I don't think alternating current would be effective so only one is really needed.
I guess you got the 250gph BIOCUBE ,i got it for $12 and a few 750gph
The ones I got were 950 gph
i was wrong it was 950gph i got for a bigger tank, the 250 gph i got was for a smaller tank
On the package of the 250gph biocube it says it for 30 gallons or under ,so a 20 gallon is perfect for it
found them on amazon 950gph was $18.92 and the 250gph was $12.14 all with free shipping i think i bought the last 2 at that price on 250gph
WOW price went up on both of them now,$18.12 for 250 gph free shipping and about $25 for 950 gph
also idea i am looking to get for my tank is glow in the dark sand,but be good for you too,give it a very cool effect