Hello.. I have got the below rocks from a colleague.. They look great for iwagumi scaping.. However it kind of has a "chalky powder grey surface" I have bleached it, soaked it for 4 days, rinsed it in hot water ..but the chalky slime still persists..
Is me say it is a property of "Borneo wild rock" but am still sceptical..
Love to hear some feedback
uploadfromtaptalk1408721213408.jpguploadfromtaptalk1408721236361.jpg
The first pic look like Ohko stone,aka Dragon stone.
The 2nd pic not sure but i had it in my tank last year.
If you are still uncertain about the rocks do a Ph test.
To test the composition of your rock, put a few drops of
ordinary white vinegar on it. If it foams, it's calcareous,
meaning it is known for its ability to both harden the
water and increase the pH.
Thank you 😃
You're welcome
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