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I would like to know on how to adding calcium into my tank. I buy a azoo calcium powder, and it say there 1 spoon of calcium mixed with 5 litter of water and have to finish in 5 to 6 days. I used dripping system into sump. About 1 litters a day and takes about 45mint to finish. My question: how...

I want to add sand to my tank, my tank is already running for about 6 month. In the tank I have about 1in sand, to add another 2” sand. How do I do that, just add in or I have to do something. The sand I buy is a dead sand, it is for saltwater tank, like sugar the color and size.

I have 1 maroon clown about 2”, and I decide to buy 1 more to make a pair. But the new one always attacks by the one in the tank at every time try to put in. what should I do now. The new one a bit smaller then the old one.

I buy a live rock last Sunday for about 10kg. I buy the rock from the only shop in my places and the rock arrive at the shop same morning. I don’t think the rock is ready curing. So I start to curing the rock by cleaning the mud and put in a tank with filter and protein skimmer. The problem...