| I am actually in the process of doing one myself I will post some pics as soon as I get my computer working again. As for the foam foster and smith have some pond foam thats fish safe its a little pricey and for all I know it might just be the same thing as great stuff foam but black. Alot of the types of foam out there break down in a tank from the lighting, some of the foams say they are UV resistent but if you make the wall use a two part epoxy and some argonite on the foam parts it is supposed to help prevent breakdown. with all that said I am still going into this project with the expectation that it will need replacing or removing over time and probably will not be able to be a long term part of my tank. | 
