It is a 55g with a koralia 4 pump for circulation and an Eheim Ecco 2236 for filtration. I've got some driftwood, quite a few medium sized rocks, and a moderate amount of plants, anubias, crypts, and grasses mostly.
For substrate I'm using a mix of turface and flourite dark. Which is really where my big question comes in. I was using flourite sand in my other tank and wanted something that would mix with the turface without separating and looking fairly similar in color. It wasn't until I got the flourite that I found out that it looks fairly sharp. I don't think there would be an issue with the turface because it is light and doesn't seem to bother my corys in my other tank at all (their barbels all look great). I'm not sure about the flourite though. The mix is probably about 2 to 1 turface to flourite and I tried to mix it together well.
So the main question is, will the flourite be an issue with most types of loaches?
The second part of the question is which type of loach. My plan was about 8-10 madagascar rainbowfish, 4-6 hillstream loaches, and 6-12 of another loach.
I currently have 4 madagascars and 4 hillstreams.
The yoyos are easy to find, but to get a decent size school that uses up a lot of space in the tank because they get kind of big. I like the zebra loaches but I don't know how easy they will be to find, they are also not too big so I could get a decent sized school without overloading the tank. The other option is dwarf chain loaches, but they end up being quite a bit smaller then the madagascars (though I don't think that would be much of an issue), not sure how hard they would be to find either. There might be other options that I don't know about too.
And would there be any aggression issues with any of those and what I already have. Since I know most loaches are at least semi-aggressive.
So will the substrate be an issue or is there a specific type of loach that would fit with it better? Any other types of smaller loaches that might work? How hard are the dwarf chain and zebra loaches to actually find? (preferably in Salt Lake City if anyone knows the area, its a 2 hour drive but its the closest big city I have to work with)
At this point it would be possible to re-home the fish I have and replace the substrate if that is really important, but it would be a big PITA and I would like to avoid that if at all possible. I'm also not aware of too many sandy substrates that are good for plants.
And last, here are a few pictures of the tank (though I should have done a full length one) for reference to the substrate.


