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I think you have an octopus. They can fit in the smallest of holes.I once saw a show showing an octopus squeeze through a pipe the size of a dime to get to the other side. The octopus was huge too, like basket ball size. Not only that they can change their skin to look like rocks and their color too. So even if you did see it, you might not even notice it.
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Its a good idea to have a refrence sample for alk test kits. 1.1350 grams of baking soda in 1gallon of distilled water=10dkh. Check your alkalinity test kit!
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