Hey there! My boyfriend and I recently got some awesome news! Someone in the neighborhood is selling a 125 gallon tank and stand for 300 dollars! What a steal! Now we just have to worry about substrates. We have been using riverbed sand for our 40 gallon tank, but now that we are getting a new filter for the larger tank, we were wondering what would be a good, aesthetically pleasing substrate. Gravel is a no go, since he could hurt himself if he ate it... we were thinking maybe crushed coral but ai imagine it does the same if not worse damage in comparison to sand... does anyone have any suggestions? Thanks so much!