Wow that
is baffling!
I've never gotten my nuts stuck too, or behind a baffle, guess it could happen.
Don't think it would hurt anything other than it might be rattling if they became dislodged.
Most small tanks I've encountered are unbaffled.
1/4" nuts seem to work well, but I've used rocks & bolts over the years also.
I guess you could get your rocks out if you shook it vigorously.
Oh my, I better quit, it is beginning to read like a romance novel.