this Heiko Bleher again and I wanted to add to the Corydoras thread:
1. Those who write about not using fine sand in an aquarium are not "fish" but rather "plant" people. I think still the most important in any aquarium (to be successful and correct for the fishes) is, to give the creatures who have to live in it, that what I need, what they are used to and the companions they know - recognize.
2. The theme public aquarium in São Paulo - unfortunately - has actually little to do with what it really looks like in nature. I tried for year now, to do really - nature-like authentic aquarium decoration for that habitat were I went, which I saw i nature with my own eyes and were I collected the fish species and only those I place together. In an decorated environment as I saw it, with similar (or same) rocks, gravel, sand, driftwood, plants etc. Only the fish-community which lived together and the density as seen, or researched. It is an different approach, but a very successful. Almost every tank I decorated this way, was so welcomed by the fishes placed into it, that 9 our of 10 started to spawn the same day I placed them...
Who can say that from another way of decorating and tank?
Have a look at Bleher's Biotopes: http://www.aquapress-bleher.com/inde...d=35&Itemid=53
And yes, some Corydoras may live longer (and even look happy) over large gravel or rocks, but believe me it is not their environment and sooner or later they will be unhappy. Make one part with fine sand and the other with rocks if you want them, why not?
Best regards from one who has discovered many Corydoras (such as C. haraldschultzi, C. sterbai, C. xingunesis, C. araguaiaensis, C. gracilis, etc., etc.).
Heiko Bleher www.aquapress-bleher.com