Moved the first two rays into there new home yesterday, both are doing good, exploring and eating. One of them found the return bulkheads and hasn't stopped surfing in them since, except to eat.
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Probably give it another day or two and then move in a couple more.
No bowing issues, actually didn't here this thing creaking at all when filling it. We put the braces in as a precaution before filling it. They will be staying, if nothing else it gives us a good place to hang lights from. They aren't water proofed but I don't think thats going to be an issue, have had unwater proofed braces on my other pond for 9 months without an issue.