[keziahamber]

Someone selling cichlids told me me it just takes a piece of coral in the water to harden the water. Is this true?:fish5:

 

[Tim Wheatley]

Coral can raise pH and harden water, yes.

Limestone is ancient coral, it also raises pH and buffers water.

I'd personally just find a fish store that sells Texas Holey Rock, that way you give the fish holes that they like to hide in.

 

[keziahamber]

Somewhere on the internet I converted 150 ppm (my water) to be 8.4 dhk? Would you go by this chart?



0 - 4 dH, 0 - 70 ppm : very soft
4 - 8 dH, 70 - 140 ppm : soft

8 - 12 dH, 140 - 210 ppm : medium hard

12 - 18 dH, 210 - 320 ppm : fairly hard
18 - 30 dH, 320 - 530 ppm : hard




I'm finding that on different websites, the water hardness scales vary?