I am assuming its salt sediment, but have read about calcium deposits but dont know much about it to be honest and do not have a tesing kit (buying one today).
My PH is slightly high at 8.8, will be sorting that today.
Temp and SG are ideal and seem stable.
Also what testing kits are absolutely necessary, I currently have pH, nitrate, nitrite and ammonia.
So any ideas guys.
Many thanks xx