SKU: 54839493998

Yellow Hydnophora

Sale price$26.99 Regular price$29.99
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Description

Yellow HydnophoraYellow Hydnophora is a striking coral with a temperament that sits halfway between SPS and LPS, and a personality best described as looks polite, hits hard. Its neon yellow green glow makes it an easy seller, but it needs thoughtful placement to avoid warfare. Heres a practical care guide built for real reef farm conditions. Lighting Moderate to high light works best. Around 150 to 250 PAR keeps the yellow vibrant and prevents browning. It doesnt

Yellow Hydnophora is a striking coral with a temperament that sits halfway between SPS and LPS, and a personality best described as “looks polite, hits hard.” Its neon yellow-green glow makes it an easy seller, but it needs thoughtful placement to avoid warfare.

Here’s a practical care guide built for real reef farm conditions.

Lighting

Moderate to high light works best. Around 150 to 250 PAR keeps the yellow vibrant and prevents browning. It doesn’t demand extreme light and actually holds color well under mid-range intensities, which makes it flexible for mixed reefs.

Flow

Moderate to strong, with a turbulent pattern. You want water that rolls over the coral from multiple directions so debris doesn’t settle between the ridges. Consistent movement also helps maintain tight polyp extension.

Placement

Give it space. Hydnophora is notorious for tissue-contact aggression. It doesn’t send long sweeper tentacles, but if it touches another coral, it usually wins and melts the neighbor’s tissue. A few inches of buffer is wise.

Place it mid to high in the rockwork where it gets light and flow without brushing against anything.

Water parameters

It thrives under SPS-like stability, though it’s more forgiving than Acropora.

Calcium around 420.
Alkalinity around 8 to 8.6.
Magnesium near 1350.
Nitrate 5 to 15.
Phosphate 0.03 to 0.1.

Ultra-low nutrients can dull the yellow and slow growth. Slightly nutrient-positive systems keep it glowing.

Feeding

Primarily photosynthetic. It does not need direct feeding. Occasional amino acids can sharpen color but not required.

Growth behavior

Yellow Hydnophora forms thick, knobby branches or mounding plates depending on flow and light. Growth is moderate, not explosive, but steady. It develops a sculpted bumpy texture that customers tend to love.

Temperament

Highly aggressive on contact. Think of it as an LPS-style fighter disguised in SPS clothing. Never let it touch fleshy corals or delicate SPS.

Sensitivities

Stable alkalinity matters. Sudden swings can cause recession at the base. It’s not commonly targeted by SPS pests, but it can suffer from bacterial infections if damaged.

Compatibility

Best in SPS-dominant systems or high-flow mixed reefs. With proper spacing, it becomes a safe and stunning centerpiece.

Shipping Notes
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Exchange/Return Notes
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SKU: 54839493998

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Scottytoohotty
Lake Worth, US
★★★★★ 1
DO NOT BUY THIS GARBAGE
Size: 20-35 HP
DO NOT BUY. Stopped working after 2nd trip total of 2 hours use. Not returnable after 30 days. Could easily ruin your engine. Expensive garbage.
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Reviewed in the United States on March 19, 2026
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Thomas W.
Alexandria, US
★★★★★ 5
Looks very good quality to me.
Size: 85-300 HP
Everything looks good quality to me. I find it odd that the people leaving bad reviews with pictures of broken and melted impeller, when you can clearly see the brass on the inside is brown and dirty like old pennies and mine is shiny new. It's almost like the took the pictures of the ones they replaced to get a refund and a free repair kit.
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Reviewed in the United States on April 26, 2026
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Amazon Customer
Charlottesville, US
★★★★★ 5
Well made materials.
Arrived on time and well packaged. Good quality materials and exact fit. Perfect fit, Easy to install. Make sure to review installation instruction. Don't put the gaskets in the wrong place. Will buy again from this vender.
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Reviewed in the United States on September 17, 2025
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Outdoorfun
Waukegan, US
★★★★★ 5
Good for the $$$
Worked great on my Mercruiser Alpha One Gen 2. Once the bottom unit of the outdrive is off and cleaned it only takes a few minutes to install impeller, seals and housing. A very affordable alternative to taking it to the shop.
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Reviewed in the United States on September 22, 2025
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FrankieJ
Louisville, US
★★★★★ 5
Fit perfectly and very complete set of parts
Had everything I needed plus some extra parts in the kit. I probably could have just replaced the impeller for slightly less but while everything was disassembled you might as well replace the works. Included - Water Pump Impeller, Housing, Key, Face Plate, Face Plate Gasket, O-Ring, Seal Face and Carrier Assembly Oil Seal
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Reviewed in the United States on October 28, 2025

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