animal aquarium fish fish tank freshwater platy tropical underwater water wild wildlife albonubes Minnow Tanichthys tank barb biotope freshwater fish freshwater tank garra garra fish garra flavatra leaf leaves panda garra plant rainbow garra rock stone under sea view under water under water world aquatic beach brackish fresh h2o life mammal nature ocean reef river sea seal underwater water beluga whale aquarium-fish artificial breeders breeding colorful colors colourful colours common community-fish differences freshwater-aquarium-species guppies guppy guppy-strains hardy jar live-bearing-species millionfish pattern-variations patterns peaceful plastic-vegetation poecilia-reticulata popular rainbow-fish shapes Sizes small-size species tank-water temporary-container tropical-fish variable-food-preference variations variety widely-distributed alligator-gar-fish ambush-predators atractosteus-spatula carnivores distinctive-snout elongated freshwater-fish gar habitat-destruction large largest-garfish piscivorous predator-fish primarily-piscivores primitive-fish river-fish riverine Singapore Southern-United-States stalking-predators torpedo-shaped unusual voracious zoo