Quote:
Originally Posted by kenghua
May I ask how long were you away? Does your tank cover have any holes for air to pass through?
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Kind of hard to say, in extreme case like a congested tank a matter of minutes fish will start gasping for air on water surface. On the other hand in a sparsely populated tank fish may not be impacted. Also note that water temp plays a part. In day time when temp is higher more impact than in the night or cool day. Fish tolerance also play a part, koi, goldfish, barb, rays, ATF, armatus, tiger...would die first, followed by pleco, aro, hook, catfish type....others like bichir, gourami, gar... will survive. Size also does matter.