Down:
1.
 A kind of Hygrophila that’s poisonous emersed.
2.
 I am a type of cryptocoryne, which has the same name as a pink bird.
3.
 A Bacopa also known as 'moneywort' among aquarists and 'brahmi' among herbalists
Across:
4.
 Hygrophila originating from India.
5.
 The smallest known Cryptocryne.
The answers will be revealed in a weeks time.