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If your aquarium is filtered, and has been for a long time, it is likely cycled. So a 10% change would be fine in order to keep nitrates low. I won't explain the nitrogen cycle to you since I assume you are very familiar with it after working in the aquarium department! But for an uncycled tank (cycling can be challenging to complete and maintain in volumes less than 5 gallons, but not impossible though), 100% changes are best. Gets rid of all accumulated ammonia. Though if someone regularly tests their water for ammonia, nitrite, and nitrate levels and finds everything is hunky dory with their system, then continue with it!
By the way, Chickenfaerie, 74-76 degrees is actually an OK for B. splendens. A steady temperature from 74-78 degrees is a good range. Anything colder than that, and they won't be as healthy, active, or vibrant. A cold betta clamps their fins, barely moves, and appear pale. There is no comparison between betta kept in a heated, clean tank with enrichment and one kept in a filthy, cold bowl.
If your aquarium is filtered, and has been for a long time, it is likely cycled. So a 10% change would be fine in order to keep nitrates low. I won't explain the nitrogen cycle to you since I assume you are very familiar with it after working in the aquarium department! But for an uncycled tank (cycling can be challenging to complete and maintain in volumes less than 5 gallons, but not impossible though), 100% changes are best. Gets rid of all accumulated ammonia. Though if someone regularly tests their water for ammonia, nitrite, and nitrate levels and finds everything is hunky dory with their system, then continue with it!
By the way, Chickenfaerie, 74-76 degrees is actually an OK for B. splendens. A steady temperature from 74-78 degrees is a good range. Anything colder than that, and they won't be as healthy, active, or vibrant. A cold betta clamps their fins, barely moves, and appear pale. There is no comparison between betta kept in a heated, clean tank with enrichment and one kept in a filthy, cold bowl.
