R

Reproduction 13, 17 Respiration 17, 77, 21, 22, 32, 33, 74, 76

Reverse osmosis (R.O.) 27, 27 unit 27, 27 water 37, 37, 67 River 72 Africa 125 fast-flowing 139 light zones 24 plants 24 systems 58 tropical 58 Rocks 11, 18, 79, 37, 37, 42, 54, 55, 75, 82, 89, 94, 96, 96, 97, 98, 99, 99, 102, 103, 116, 7 76, 7 77, 118, 119, 125, 725, 126, 134, 192 basalt 94 calcareous 94, 94 chalk 94 coal 94, 94

granite 94, 94, 97

lava 94, 97 limestone 94 marble 94 pebbles 94, 99 quartz 94, 94

rockwork 99, 102, 102, 194, 197 sandstone 94 slate 94 tufa rock 94 Rockwool 52, 53, 54, 55 Roots 17, 18, 18, 19, 38, 38, 39, 39, 40, 43, 45, 46, 47, 47, 49, 51, 52, 53, 54, 55, 67, 72, 74, 74, 75, 76, 80, 81, 81, 82, 83, 84, 119, 125, 725, 126, 168, 181, 182, 187, 189, 193, 194, 197

growth 76, 80 production 75 rhizoids 136

725, 126 rooting medium 193 tubers 19, 79

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Aquarium and Fish Care Tactics

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