Not sure what you mean by out of control but water sprite is nice, it grows fast, has a soft lacey texture, and is great for absorbing excess nutrients in the water. It can be trimmed with an easy snip or two to whatever height you want. It can also be floated but I think it looks better planted. Stem plants are going to require alittle more work but narrowleaf temple doesn't grow wild and spread all over. Looks like you already have a sword and some crypts. Corkscrew val doesn't get nearly as big as other vals and seems to grow at a slower pace. If it puts out a runner that you don't want just snip it off and take it out. Those are all pretty simple plants IMO.