How do you "mark" things

[DmitryB]

How do you guys mark things in a reef-safe way? Like, if I want to mark inside my tank what the correct water-level is in the return chamber of an AIO (no way to do it outside because it's against the wall), how can I mark it in a reef-safe way? No duck tape, no sharpies, etc.

Or for that matter to mark inside a Brute bucket where my RO/DI water should be for mixing new salt water, how to mark that line?

 

[JumboShrimp]

I'm not sure I'm following your intent precisely, but this label maker tape is pretty durable; you don't have to print anything if you don't want to-- you can just use it as a piece to serve as a mark.

 

[DmitryB]

A label maker??? (I do have one of those.)

 

[JumboShrimp]

I use it to put a mark inside plastic buckets, for example. And on the outside of tanks. I can't say if fish would pick at it if you put it inside the tank, if that is your aim-- but a test piece would probably give you an answer pretty quickly.

 

[DmitryB]

This label would be in the back return chamber, so not accessible to fish (unless they try to escape through the back.) I just didn't know it was "reef safe." Thanks!

BTW the intent is just to mark the waterline of where to stop when doing water-changes in the tank, or in the Brute bucket where to stop making RO/DI.

 

[JumboShrimp]

Just as a caution-- because I don't want to overstate my case (lol)-- but don't expect it to last forever without degrading; but at least if you can see it, you should have plenty of time as a 'heads up' to know when to replace it. It might be a yearly maintenance item, for example.