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Closed Loop teaches self-sustaining aquariums, vivariums, and ponds: systems that run on plants and biology instead of a wall of equipment. There is a 87-species database and a build planner behind everything. Pick the path that sounds like you.
You want one jar or tank that does not die
Start with the smallest real ecosystem: a dirted tank or a shrimp jar. It teaches the whole loop, cheaply.
How to set up a Walstad tank →You want frogs, geckos, or a terrarium
A bioactive vivarium runs a cleanup crew that handles waste, so the enclosure filters itself. Start with the drainage layer and the crew.
Bioactive vivarium guides →You want a pond
A living pond holds itself clear on plant coverage, not a pump. Start with plant ratios and light.
Living pond guides →You have a tank and something is wrong
Algae, cloudy water, melting plants, a stalled cycle: most of it traces to light, nutrients, or overfeeding. Find your symptom.
Troubleshooting →Not sure what will balance? Use the planner.
Answer five questions and the planner returns a stocked, planted build with a will-it-balance read, computed on the same database the guides render from. It is the fastest way to skip the first dead tank.
Open the build plannerHave a specific question? Search the database.
117 records with the temperature, pH, hardness, light, and size that decide what shares a system. Filter it, and settle a compatibility question in thirty seconds.
Browse the databaseOne build breakdown a week.
A stocked, balanced setup pulled apart: the plants, the cleanup crew, the parameters, and where it would go wrong. Free.
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