Some time ago I used heavy fishing line to tie a number of java ferns to rocks to hold them down. Tonight I found one of these loops around the head of one of my big male BNs. I had to catch him with a net and, since it had worked its way so far up that I couldn't pull it off, hold him while I cut it off with a scissors. If I hadn't noticed that the zucchini in that tank remained largely uneaten, I might not have seen it until it was too late.
After I removed it he hid for a while under a filter, but now he is eating again. Do take care using fishing line in the tank.
After I removed it he hid for a while under a filter, but now he is eating again. Do take care using fishing line in the tank.