my son's 6g cube

Your tank history (other thread) and keeping the mix of corals in a small tank is a great task at hand. So congrats on that! As you know, smaller water volumes are more finicky. One thing, I’ve learned over the years is to empower my corals (+ zooxanthellae) to out battle nuisance algae in my tank. Keeping calcium (450+), magnesium (1300+), and alkalinity (10+) at high ideal levels. Plus feeding coral food / amino acids, etc. I’m assuming you’re testing most of those levels but I would expect with small water volume those are being depleted quickly. Also nitrates & phosphates need to be maintained.. but corals will need small amounts. Flow and excess nutrient removal is also key for most corals, which is sometimes challenging in a small tank.
 
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alk 10+ is a little high for me (moving from red sea black bucket to blue bucket). If I could get nitrates to show up at all I would be very pleased. :)
 
My tanks always have 0 nitrates as well. i guess i'm too aggressive with cleaning :(. I started just dosing neonitro now. I'm sure the tank will be back to its glory days.
 
I've added more flow after removing 75% of the sand and doing a few deep cleans.

I was dosing dosing dosing but who knows. I'm going to stop dosing for a bit, do a few small water changes, add fresh purigen + carbon, and then add some macroalgae.

The pico tank is tricky. :)
 
macro algaes added - I actually got too much caulerpa!

I really need to take the rocks out and glue them together in this tall configuration sine the stack is a little wobbly.

IMG_6431.jpg
 
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