Hi
The coloration of the corals is also depending on thesalts you use
and if the salts contains to much Trace elements you wil get brown corals.We checked severals salts also in UK available salts and they was the same
in coral reaction and water parameters
In our european experience we know that the salts change sometimes the paramatern and the reaction of the corals is from batch to batch different.
Greets CLaude
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