Thanks.
To be honest the sheer logistics of pulling out are daunting enough to keep me to press on. I'm also too far along on my inwall (despite the running joke of how long it's taking to put water in it) to really abort that, the whole basement has been drawn up around it so .. so I guess that's that. Just have to find a way to make it work is all.
If this isn't an argument to consider BB tanks though and forgo the need to have cucumbers in the tank, I'm not sure what is. Although it's weird, if it was the hitchhiker cucumber, I thought it was a garden variety tiger-tail, and I thought these were reasonably safe to keep. Although I suppose if something happened like it went into the overflow pipe or a pump intake, who knows, maybe in that case still, "anything goes."