Posted: 05/06/2017 at 23:14
Hi Angie, I have both in my pond and have found brooklime to be the more vigorous to the point of invasive. My pond is about 2.5 metres x 2 and the brooklime had no trouble covering the whole surface, since then I've had to haul out big clumps.
Both can be rooted in gravel as the plants will take nutrients from the water and decaying matter trapped in the gravel. Also they pull free relatively easily if you need to reign them in. Water forget-me-not is better behaved, another good plant is lesser spearwort with it's buttercup-like flowers.
Your pond looks lovely