Aquarium Heater 25W-300W Adjustable Submersible Thermometer
Aquarium Heater 25W-300W Adjustable Submersible Thermometer
Adjustable Aquarium Heating for Tanks of Multiple Sizes
Maintain a comfortable water temperature with the AQUANEAT adjustable aquarium heater. Choose from five wattage options for freshwater, saltwater, fish and turtle tank setups.
Please Note: This listing includes five heater options: 25W, 50W, 100W, 200W and 300W. Select the appropriate wattage for your aquarium before ordering.
Key Benefits
- Adjustable Temperature: Top-mounted dial allows temperature settings from 65°F to 89°F.
- Automatic Thermostat: Cycles heating on and off to help maintain the selected water temperature.
- Visible Heating Indicator: Red indicator light shows when the heater is actively warming the water.
- Separate Thermometer Included: Makes it easier to monitor the aquarium’s actual water temperature.
- Freshwater & Saltwater Use: Suitable for freshwater, marine, fish and turtle aquariums.
Wattage Guide
- 25W: Recommended for approximately 3–5.5 gallon tanks
- 50W: Recommended for approximately 5–15 gallon tanks
- 100W: Recommended for approximately 15–30 gallon tanks
- 200W: Recommended for approximately 30–50 gallon tanks
- 300W: Recommended for approximately 40–75 gallon tanks
Product Details
- Five selectable wattages: 25W, 50W, 100W, 200W and 300W
- Temperature range: 65°F–89°F
- Power supply: 110–120V corded electric
- Includes one heater, two suction cups and one thermometer
- Heater dimensions and cord length vary by selected wattage
Important Safety Information: Fully submerge and secure the heater before connecting it to power. Never operate or touch the heater outside the water while it is powered. Unplug it and wait at least 10 minutes before aquarium maintenance, water changes or removal.
Choose the wattage that matches your aquarium and monitor the water regularly with the included thermometer.
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Feeding & Diet
Feeding & Diet
An opportunistic omnivore, the Seahorse will scavenge detritus, uneaten food, and algae — making it a natural cleanup crew member. Supplement with small meaty foods like mysis shrimp or pellets 2–3x per week if natural food sources are limited.
Care & Water Parameters
Care & Water Parameters
The Seahorse thrives in stable, well-maintained reef conditions. Target parameters: temperature 72–78°F, salinity 1.025–1.026 SG, pH 8.1–8.4, and alkalinity 8–12 dKH. A mature, established tank of at least 20 gallons is recommended.
Reef & Tank Compatibility
Reef & Tank Compatibility
Generally considered reef-safe. The Seahorse coexists well with most corals and peaceful fish. Use caution with very small invertebrates or slow-moving tankmates. Provide ample rockwork and hiding spots to reduce territorial behavior.
Size & Growth
Size & Growth
Seahorses are typically shipped at 0.5–1.5 inches. They are slow-growing and generally remain small, making them well-suited for nano and mid-size reef systems.
Shipping & Live Arrival Guarantee
Shipping & Live Arrival Guarantee
All livestock ships with heat or cold packs as needed and is packaged for safe transit. We stand behind a live arrival guarantee — if your animal arrives DOA, contact us within 2 hours of delivery with a clear photo. See our full DOA policy for claim details.
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