Pond foam

[Mr Cob]

Also.. using foam on glass is not a premanent option. It is kind of permanent on acrylic in that you cannot scrape it off without scratching the heck out of the acrylic.

When I sold my old 85g the new owner pealed all of my beautiful work off lol.

[koa25]

That turned out horrible, Rob. Just Horrible. Figured i'd let you down easy before everyone else chimmed in. ha ha. Lesson learned. Rob has skills.

[Mr Cob]

here is from the other side... you can see the acrylic piece I used is super thin and did not take from the depth of the tank...

[Mr Cob]

another note...don't let the foam bubble up otherwise you get poop looking foam walls. Poke it when it bubbles up and move the foam around with a stick and I promise it will look more realistic when it dries..sprinkle some aragonite on it while still wet to really give it the rock texture.

DO let it bubble up if you want to be able to mount frag plugs to it easily. I did that in a few areas on the bottom.