Explore, Build & Master Aquatic Ecosystems
Connect with advanced aquarists, dive deep into reef chemistry, build stunning planted aquascapes or crystal-clear backyard ponds, and work through complete expert-written masterclasses.
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About Submerged
Submerged (submerged.fish) is a community built by passionate aquarists. We bridge the gap between beginner troubleshooting and master-level husbandry.
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Freshwater & Planted Aquariums
From high-tech CO2 injected Dutch scapes to blackwater biomes.
Latest Freshwater Discussions
Saltwater & Reef Aquariums
LPS/SPS coral propagation, marine quarantine protocols, and reef chemistry stability.
Tank Transfer Method (TTM)
Eliminating marine ich without harsh copper medications using sterile 72-hour transfers.
PAR & Spectrum Tuning for SPS
Balancing 250-350 PAR with high blue-to-violet ratios for maximum polyp extension.
Refugiums & Nutrient Export
Culturing Chaetomorpha algae under reverse daylight cycles to scavenge nitrates.
Saltwater Masterclasses
Latest Saltwater Discussions
Brackish Water Estuaries
Where rivers meet the sea: dedicated to mollies, knight gobies, archers, and green spotted puffers.
Simulating Mangrove Estuaries
Aragonite sand substrates, mangrove prop roots, and marine salt mixing to maintain steady specific gravity (1.008–1.012).
Beak Maintenance in Pufferfish
Hard-shelled snails and crustacean diets mandatory in brackish setups to prevent overgrown teeth.
Brackish Masterclass
Latest Brackish Discussions
Backyard Ponds & Water Gardens
Pond construction, biological waterfall filters, koi health, and seasonal winterization.
Gravity-Fed Wetland Bogs
Constructing low-maintenance upflow bog filters using graded gravel and marginal plants.
Jumbo Koi Selection & Care
Evaluating conformation, parasite management, and summer feeding schedules.
Cold Weather Gas Exchange
Preventing toxic gas build-up under ice sheets using floating de-icers and aerators.
Ponds Masterclass
Latest Pond Discussions
Target Water Parameters
Select habitat to view chemical standards and troubleshooting matrices.
General community target
Strict zero tolerance
Strict zero tolerance
Controlled via changes
Fully Completed Expert Masterclasses
Complete, module-by-module courses covering lighting spectra, dosing regimes, aquascaping, and biotope builds.
Related Masterclasses
Discuss This Course
Have a question about a module? Start a thread tagged to this masterclass and the community (and the author) will weigh in.
Hobbyist-Focused Gear & Affiliates
Hand-tested equipment, precision controllers, and LED lights trusted by the community.
Neptune Systems Apex & Trident
Automated daily testing of Alk, Calcium, and Magnesium with cloud alerts.
EcoTech Marine Radion G6 XR30 Pro
Edge-blending optic technology producing uniform coral color and spread.
CO2 Art Elite Dual Stage Regulator
Zero end-of-tank dump guarantee with integrated precision needle valve.