I have a 120-140 gallon saltwater tank that had a massive, massive aiptasia infestation. I emptied and drained the tank, filled it with boiling water, drained it again, etc. Now I just have sand and an inch of water in it. I let it sit for a week, hoping to freeze/starve anything lingering. Instead of putting it back together for salt, I'm considering using it for fresh and moving a catfish from one of my other tanks.
The issue: It's got an overflow, 20 gallon sump, etc. It would be impossible to scrub every inch, including places my hands can't fit. It's a very old tank, with salt deposits on dry surfaces. Is it possible (via water changes) to fill and drain the tank repeatedly to get the salinity down to acceptable levels for fresh water, or are there other factors I might not be considering?
The issue: It's got an overflow, 20 gallon sump, etc. It would be impossible to scrub every inch, including places my hands can't fit. It's a very old tank, with salt deposits on dry surfaces. Is it possible (via water changes) to fill and drain the tank repeatedly to get the salinity down to acceptable levels for fresh water, or are there other factors I might not be considering?