Just made a few changes and upgrades to my general maintenance, including getting a 44gal Rubbermaide Brute for water changes. For conditioners and treatments, I want to know how much water I have so I don't over or under-dose. Will use 5gal carboys to fill up the trashcan to measure amounts (probably in 10gal increments) but I'm not sure how to mark the levels.
Can I use a regular, non-toxic black marker or do I need something drinking-water specific? Seems stupid but don't want to invest in all this stuff, then kill my fish with $2 marker
Can I use a regular, non-toxic black marker or do I need something drinking-water specific? Seems stupid but don't want to invest in all this stuff, then kill my fish with $2 marker