Some little BG/CNBG managed to survive in my nearly empty forage pond, but hopefully they won't interfere much with the big CNBG reproduction.
The tenacity of living organisms never ceases to amaze me!
I am designing my forage ponds to be capable of being drained completely dry, because I don't trust my ability to manage the pond successfully against a competing pre-existing population that has OTHER goals.
Mine was designed the same way, but never gets completely dry even during summer droughts. Ground water, I think. No question, life will find a way!