New plants and new disease to identify

In message , Peter
Demski writes

Well I was out of town this weekend and came back to a couple
surprises. The guppy that I had placed in my quarantine tank was
dead and covered with fuzz. The big surprise was there were 9
fry swimming around in the tank also. They don't show any
signs of disease or any other problems though. Apparently the
2 new plants like my tank. the second one that everyone is not
sure of grew about 2 inches and the hornwort grew about 6-7"+.
At first I though the fish had somehow pulled the plants up fron
the gravel but I then realized it had just grew that much. So
good and bad new this weekend. Hopefully everything will
be fine from here on out. BTW my readings a
Ammonia:0ppm
Nitrites:0ppm
Nitrates: 20ppm
Ph:7.8(as usual)
Temp:79F

Anyone have any idea why my plants went crazy for the 3 days I was gone?

hornwort does that.

in 5 weeks the small bunch in my 13 gallon provided enough trimmings to
virtually fill the 47 gallon...

--
sophie