Its job in your tank: hardscape grower. The fern that grows on wood, not in the substrate. Java Fern (Microsorum pteropus, also classified as Leptochilus pteropus) is a slow, tough fern with long green leaves up to 10–20 inches. It grows attached to driftwood and rock, so you can put greenery anywhere in the tank. The problem Most plants need to go into the substrate and need decent light. Java fern does neither, and it's the plant most often killed by planting it wrong. How it fits the Father Fish Method Father Fish has kept fish for more than 70 years, and his method has helped thousands of aquarists build tanks that run on biology instead of bottles. A layer of living soil (Aqua Preta Complete Substrate) sits under a sand cap and feeds rooted plants for years. You plant heavily on day one and skip the CO2, liquid fertilizers and root tabs. Then the plants, the soil and the tiny life in them balance the tank. Java fern grows on your wood and stone and adds green to the hardscape while the rooted plants work the soil. Father Fish says: "Start a new tank with stems and vals. Big plants in the back, small in the front. Plant heavily at the start." Your plan Attach it, don't plant it. Tie the rhizome to wood or rock with cotton thread or fishing line, or use gel superglue. Never bury the rhizome in sand or soil. Keep the light low. Strong light can burn the leaves. Be patient. It grows slowly. Baby plants form on older leaves and can be moved. What you get 1 medium Java fern Leaves 10–20 inches, slow growth Low light. 64–86°F, soft or hard water. Good to know: Neat rows of dark dots under mature leaves are spores and harmless. Brown patches elsewhere usually mean old leaves or a buried rhizome. Why it matters Bury the rhizome and it rots. Tie it to wood and it lasts for years. FAQ Can I plant it in the sand? No. Attach it to wood or rock. What are the black dots? Spores, if they're in neat rows under the leaves. Is it safe with cichlids or goldfish? Its tough leaves are rarely eaten. How fast does it grow? Slowly. How long should I run my lights? Father Fish's rule for a new tank: lights on 24 hours a day for the first 4 days, then 10–12 hours a day.
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