Thanks so much for everyone’s replies and suggestions so far. I’ve been in touch with Red Sea. The good news is they have offered to replace the stand; the bad news is they discontinued the 450 so they’re trying to see if they can get additional stands from their factory. We both agreed I can’t leave it as is. If they cannot get the stand then we’ll have to move to a plan B but haven’t gotten there yet. They do not think the tank itself needs to be replaced - saying if it hasn’t failed it should be ok on a new stand - and haven’t offered to do so. Curious for your thoughts on that too! Lastly, I found this product and it looks like a good option and has good reviews - what do you guys think?
https://www.homedepot.com/p/Tiger-B...stable-Stud-Caps-Adapter-J-ADJUSTUD/206374535
I like it because it will let me measure close enough, and then adjust an tiny bit just enough for the sagging part to have some structural support. My plan wouldn’t be to adjust it all the way back up to level for tank support - but rather just enough to prevent further sagging while I wait a few weeks for Red Sea to get the stand in stock from Germany.
On the other comments, there is no water damage to the top of the stand. The foam mat is on, all the boards remain tightly connected, no seams showing. The tank was moved twice so maybe that stressed it in some way, I don’t know. But I too have some concern now on the longevity of these stands based on this experience.