Advice? Levels

Looks OK to me.
I run my DHK 7-8
Calcium 400-420
MG 1340-1400
I dose BRS 2 part. I just dial in my alkalinity where I like and dose same amount of calcium evert time and holds steady at 410. I rarely test calcium or mag. If your alkalinity is good and your dosing same amount of calcium part it will be good also. Don't chase perfect numbers or you will be swinging up and down. Stability is key. Dose calcium to get around 440 then do same amounts of DHK and CA and you will be good.
MG don't take much to hold levels

 

It should. How much you dosing at a time?

 

If your numbers get too high, it can actually precipitate out on surfaces.

What is your coral load like? How do they look?

I would send in a sample to AWT to see how their results compare to yours.

Dont chase a number, like Donny said, stability is the key.

I always test 3 times to make sure you get close to the same number each time.

Stable alk is the key. Get that in a good range and stable.

 

My red sea expired last month. Tested (from memory)
Dkh 16
Cal 540
Mag 1900

Api:
Dkh 11
Cal 400
Mag - no kit.
I'd check the dates. Also, use a quality syringe to get your sample volume consistent.

 

Well. I am confused also. Not sure why everything dropped out that fast.
When your dosing are you splitting that up over the day? And make sure you spread at least 5 minutes before you add the next part
Otherwise it will parcipiatate out.
Mag you can raise 100 ppm per 24 hours with no I'll effects. Alkalinity .5 per day. And calcium I think is 50 per day.
If you don't have any corals you can dose whatever just do it slow or it will parcipiatate out. That looks like that's maybe what's going on.

--- Auto-Merged, Nov 26, 2015, Original Post: Nov 26, 2015 ---

What test kits?

 

I chased similar issues and found I was trying to dose too much too fast and loosing out to precipitation. I finally got some brs dosing pumps. I dose Alk by dividing the dose by 6 and dosing a little every hour over six hours during the night and split my calcium into two half size doses in the afternoon. I was seeing precipitation in my sump around the heater before doing that, now my numbers stay fairly stable.

 

Remember, only bad things happen fast in this hobby, I bet if you dose a little every day you'll be where you want in e couple weeks.

 

Honestly, you have a very light coral load. I bet most of the numbers you need can be maintained by water changes.

Higher numbers are not necessarily better.

Think of your tank as a big bowl, and the elements as marbles. Your bowl can only hold so many marbles, if you add to many, they are going to fall out onto the ground (Precipitation)

 

I dose small doses every hour. Alk is dosed top of the hour.
Calcium 5 minutes later and mag 5 minutes after that. And I have a power head pointed where it's being dosed.
When I had the brs dosers. I did Alk top of hour and calcium on the half hour and manually dosed Alk every 2 weeks.
Sounds like you have a good plan. And sounds like everything is precipitated out.

 

I would really test and see how much you are using in a two week span. With that few of corals, I doubt if it is very high.

Your tank would be a good candidate for dripping in some kalk wasser during the night. I did that for years and had a killer tank. Drip in some mag too if you want, but I bet you barely use it.

 

Chiming in on the water change deal. Best my corals have ever done is with weekly water changes. Skimmer, filter socks, rock filled sump, carbon dosing... Great, but still not able to extend water changes. It's not the nitrates or phosphates, but something there that just has a strange impact. Something you can't test. Every now and then I do two a week. The first indicator I've seen on organic buildup in water is growth of micro algae and cyano. Never get much of a nitrate or phosphate reading because the micro algae is sucking it up

 

i agree with the water changes..no need to dose until you get more corals or larger colonies. try not dosing for a week test everyday and figure out how much alk u are using everyday..don't worry so much about mag till u get your alk stable. Hope this helps you

 

What test kit you using with the Mag? If you are running the red sea pro, make sure to add the drops/reg slowly or this will through off the results majorly.