concrete

Here's the progression of building my DIY foam and concrete background. It was a fun project for sure! The plan is to get at least one 8'x4' sheet of insulating foam from my local hardware store and cut that down to size to make a rock background. Cut out "rock pieces" from the remaining part...

I've made a foam and concrete background and currently have it soaking. I've changed the water from the tank quite a few times (on maybe half a dozen or so now). I left it soaking for about 5 hours last night and the pH was back near the top of my High range pH test kit (it's likely that it...