02-28-2012, 01:34 PM
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Most of that sounds OK, but the high nitrates may be one problem. This species is very sensitive to water conditions. Some floating plants would help, if none of those mentioned are now at the surface, as they assimilate a copious amount of ammonia and nutrients which will help maintain stability in the water parameters and nitrification, plus they release a lot of oxygen through their roots and this too is critical for this species.
What type of filtration and water movement do you have? While it does not want a raging torrent, this fish does occur in flowing streams and has a need for good oxygen content.
It is a substrate feeder, so foods left on the substrate work best. Try feeding after darkness, as this nocturnal fish will likely prowl arond then.
They also do not like active fish around them, and the guppy is not a good tankmate for this reason. Also, the fin nipping you have witneessed might occur at other times too, indicating the BGK is highly stressed, and that weakens the immune system. The fish on its side being nipped is not a good sign, this should never occur. What other fish are in this tank?
The dim light is good, and lots of wood, etc for hiding spots is good too.