Peat moss
 

I want to know if I can safely put peat moss under my little caves? I mean will it break down and make a mess? Will it get anarobic on me if the fish don't use cave for a while? It won't be a whole lot but I want enough to buffer the water a little and make the caves a little more homey.

I think I would hedge away from it, Chris. It is an organic and will break down it the tank.

So how does it work then when it is put on top of the substrate? It is still gonna break down right, if it isn't stuck to the filters all the time.

I have seen so many references to using it for egg layers, fry and other fish fry as a source of infusoria but no one talks about how to keep it and use it right.

I have seen a lot of articles and profiles that say that Kuhli prefer some mulm and other leaves/debris in/on the substrate. I thought maybe the peat moss would work in the caves as a hiding place and maybe add that feeling of home.

I recently filled my 55g with water after adding ground peat moss as the first layer. It worked good in some ways but horrible in others. I put a thin layer of the peat moss and put a thin layer of pea gravel on top. Then, I added some water for my plants. However, the peat moss that was not covered completely by the gravel started to float. It was a big mess and it has taken it 3 days to clear up. But, in the areas where pea gravel was completely covering the peat moss, the peat moss stayed at the bottom (I can see from underneath the tank).

I think it is fine to use as long as you make sure to completely cover it with a substrate before adding water. That is my experience with ground peat moss. I don't know about un-ground type.