09-13-2013, 10:20 PM
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Hi zoeya and welcome to the forum. It's possible your fish aren't spawning because spawning season is over. Some fish only spawn during certain parts of the year and even though they are in aquariums, they seem to be biologically programmed to only spawn at that time. If the fish are acting healthy otherwise, this could very well be the reason they haven't spawned.
You may want to try separating the male from the females and conditioning each fish with frozen, meaty foods for a week before putting them back together. This may get them to spawn again.