Posting this here so other new people will see it.
Pipe Cleaners, the real ones (not the craft chenille stem ones) are fantastic for cleaning tanks, clearing out condensation, blocking center tubes while filling them, etc.
Sorry if it seems like I'm reinvented the wheel, but it took a while before I figured this out myself, and then once I knew what I was looking for I found it mentioned here and there in other threads. Thought I might save some other people some time and frustration.
Pipe Cleaners, the real ones (not the craft chenille stem ones) are fantastic for cleaning tanks, clearing out condensation, blocking center tubes while filling them, etc.

Sorry if it seems like I'm reinvented the wheel, but it took a while before I figured this out myself, and then once I knew what I was looking for I found it mentioned here and there in other threads. Thought I might save some other people some time and frustration.