- Theyarenotjellyfish,though.Yellowjellyfishandredoctopusesjetthroughcobaltwaters.Jellyfishaquariumtank(Fig.topright)thethreejellyfishareactuallymadebythesilicagel,addingthetankatthebottomofLEDlights,alsolifelikejellyfishtank.Therearegroupsofjellyfishi...
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