Did the first accurate measurement of Ammonia myself and found that Ammonia is < 0.01mg/l, Nitrite is 0.20mg/l and Nitrate is 10mg/l. Since the Alkalinity dropped severely to 5.0 dKH, I decided to open up the tank so that evaporation is increased. In one hour the topup pump came on about 6 times. Since this was quite severe I closed down the lids of the aquarium.

The RO water mixed with Kalkwasser is BAD since it reacts quickly with air to precipitate the calcium out of the solution, and pumping in the precipitate is A Bad Thing.

So I put a Tunze Calcium Dispenser in the RO bucket. Basically the RO water is pumped through the dispenser to the sump. Inside the closed dispenser is the kalkwasser mix.

Added 10ml Combisan and will try to add this on a weekly basis.

Steven tested the water and it seems to have almost no Ammonia/Nitrites. So he said it should be fine for me to add some invertebrates. Thus I purchased the following:

• Colt Coral
• Green Mushroom Coral
• LPS Brain Coral (came on the same rock than Green Mushroom Coral)
• Boxer Shrimp
• 4 Turbo Snails
• 4 Blue Legged Hermit Crabs

I replaced about 30l of saltwater with fresh RO water to fix the SG. It is now 1.025 which seem much better. The alkalinity is taking a dip though - down from 7.5 to 6. Started adding kalkwasser again by adding 4 flat teaspoons to 13l of RO topup water. This implies I have just installed a Tunze Osmolator kit that handles auto topoff.

I purchased 80kg of cured live rock from Exotic Aquarium. After a 4 hour transport I rinsed them one by one in saltwater from the tank. Since I am clueless about aquascaping I merely placed them all in a brick wall in the tank.