Lovely, Hostas and ferns will love that nutrient rich water!
I can certainly vouch for aquarium water.
A few weeks ago my son brought some sunflower seeds home from school. We planted five in pots. Once germinated we watered them daily. Four with tap water, one with aquarium water.
Unsurprisingly the aquarium water fed seedling grew a lot quicker. Fast forward a few weeks and this is the only one remaining, the aquarium water fed one. The others I tossed away in my worm heap as they were small with discoloured leaves.
The flower developed about 3 days ago which is when I put it outside, it had been growing in my fish room up until then. I don't water it as much now as we've had a lot of rain recently.
So yes, aquarium water is extremely rich in nutrient, but I already knew that. The idea of my experiment was to show my son the difference between tap water and aquarium water.
