Hi everyone,

 Yesterday I tested the water in my marine tank and noticed that the calcium was a little low about 350 ppm (usually 430ppm) I think that the Carolline algea  is absorbing the calcium since most of my tank looks red, purple, and pink.

 So is there a way to increase the calcium in my tank? Possibly in a natural way

 Is 350ppm bad for my corals?

 Thanks

You can either go for a calcium reactor or else use a calcium supplement such as http://www.aquariummalta.com/products/335-aquatic-nature-calcium-300ml.aspx

Thanks for the advice,  aquatic nature worked great, calcium is 440ppm now

 glad to hear that !!