well the majority of the plants in my pond (iris's, bullrushes, duckweed etc) came from some local ponds down the road from me, and yesterday whilst having a close look around my pond i noticed allsorts of crawly things, which must have been eggs in the plants/roots when i transplanted them from the wild pond to my pond, and after many hours of internet investigations to identify them i have discovered that so far i have : stonefly nymph, caddisfly nymph (with the little tubes they make out of silk and stones), small black water snails and water boatman beetles living in my pond, none are harmfull to fish as far as i have read so all is good !