11-22-2012, 01:35 PM
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On the rasbora spawning, it is unlikely that any eggs will survive predation, and if they should, the fry will likely be eaten anyway. It is quite common for egg-laying fish to spawn in aquaria if conditions (water parameters and the environment) are to the fish's liking. Rarely do we see fry though, because the other fish and the parents themselves know what is happening and they will readily eat the eggs or newly-hatched fry. I have sometimes had a fry or two survive, if the plants are really thick (and floating plants often help) and there is lots of wood, as they may be able to hide effectively and find sufficient food like Infusoria. And of course feeding is the next hurdle for the fry.
If you seriously want to raise fry, steps will have to be taken. The usual method with fish like the rasbora is to get them into spawning condition in their own tank and then either remove the adults after egg laying, or provide an egg mop to receive the eggs and remove this. A mass of Java Moss can serve as the "egg mop" (with no other plants in the tank so the fish have to use the moss).
On the gourami issue, what size is this tank? It is usually--but not always--the male that is the troublemaker, as they are territorial. But fish can be independent. The larger the aquarium, the less trouble as the fish can get out of each other's way when necessary. But again, this is not absolute. As you've seen, fish often have an hierarchy within the group, and one will be dominant; removing that fish sometimes causes another to take over the role. This is nature at work.