Water bottles safe for tank?

[CrazyPhishMan]

Yes, I have considered putting lumps of concrete in a tank, floating broken bit of styrofoam on the top, and draping and old mattress over the side.

The finer things…

 

[Deadeye]

Made the “pots”, a little playing with rocks and you don’t even notice the bottle.
Hopefully this helps the plants to take off.