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where are you located?
It's totally safe, if you treat it like a harsh chemical and use common sense. It eats through coralline, mineral stains, dried algae, etc. But...
Is that a 1" bulkhead?
That grown algae is likely diatoms, which are some of the fastest colonizing organisms present in our tanks :) Similar to how new tanks get set up...
Any pics of the drilled 29? I'm curious about where the drilled part is
I'm setting up a new 75 gallon system and am getting rid of some old tanks in order to make some space in my house. 30 Gallon long with stand -...