Biotope aquariums are the dedication-tier of aquarium hobby. Concept: instead of mixing species from across the world, recreate a specific habitat with biologically authentic species + parameters. Famous biotopes: 1) Amazon blackwater - tannin-stained acidic soft water, leaf litter substrate, cardinal tetras + Apistogramma + amazon swords. 2) Rio Negro - similar to Amazon but lower pH (4.5-5.5), discus + dwarf cichlids. 3) Lake Malawi rift - hard alkaline water (pH 8.0-8.5), rocky scape, mbuna cichlids. 4) Lake Tanganyika - deeper rocky pools, frontosa + julidochromis + tropheus. 5) Asian peat swamp (Malaysia, Borneo) - blackwater, betta + chocolate gourami + harlequin rasbora + cryptocoryne. 6) Central American river - hard water, livebearers + amazon swords + tetra. 7) Caribbean reef - clownfish + grunt + tang + Caribbean LPS. Resources: Biotope Aquarium Project (biotope-aquarium.info), Annual Biotope Aquarium Design Contest. Pros: educational, visually authentic, fish display natural behavior, breeding easier in correct parameters. Cons: stocking limited to small native species list, harder to find niche plants/inverts, less colorful than mixed Asian-South-American community tanks.
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