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Hello friends. What is it ? Hard white spot in the tank ( on the glass,Astrea Snail and others...) sometime clear with the razor blade but becoming 15 day later. PH: 8.1 No2: 0 Salt: 1,023g/cm3 Temperature: 77F Sorry for bad English !! Thanks for helps.

I am new to this forum. I have had a 20 gal salt water tank for about 1 years. Greetings from istanbul !