fish water would make a good solution to

[cichlid]

I currently have a 55 gallon african cichlid fish tank with a undergravel filter. I was curious if the fish water would make a good solution to grow a few plants hydroponically. I wanted to assemble the 11 plant system at waist level next to the tank since the tank in question sits on the bottom of a double stand. the ph is 8.5 would this be two high and what plants would you suggest I try first. Also what other water tests should I do and what results should I look for.