Yes it's normal to inbreed a little to preserve sought after traits, especially with siblings, but I think most people try to avoid doing it excessively. One or two generations where siblings are bred will easily be corrected in a single generation where an unrelated fish is a parent. More than that and the percentage of deformities begins to noticeably increase with successive generations because the same bad genes get passed on by both parents, so even recessive problems become frequent. This is true for dogs and humans too.
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