Tank setup
Planted tanks: light timers, CO2 check valves and surface flow
Running lights on a timer or smart plug within its rating, why standard air check valves are not for CO2, and keeping the surface open for gas exchange.
Also listed as planted aquarium, CO2 tank
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Short answer
A planted tank's main automation is the light timer. Check the load rating: Intermatic rates the TN311 at 15 A resistive and 1/3 HP, and TP-Link rates the Kasa EP25P4 at 15 A and 1/6 HP. Do not use a standard air check valve on CO2: Aquarium Co-Op says its standard valves are for air pumps only.
Key facts
- Food form to check
- Dry food only; check the maker's food list[3]
- Aeration option
- Keep water moving and part of the surface open[4]The 2020 study's authors advise keeping water moving and the surface uncovered by plants. It studied 54-liter tanks in a lab.
- Check valve and pump position
- Air line: standard check valve. CO2 line: a CO2-rated valve only[5]Aquarium Co-Op says its standard check valves are not designed for CO2 and sells a separate stainless-steel CO2 valve.
- Light timer
- Mechanical 24-hour timer (TN311: 15 A resistive, 30-minute minimum on/off) or a smart plug (EP25P4: 15 A, 1/6 HP)[8][9]Intermatic lists the TN311 as cCSAus (CSA certified), with a NEMA 5-15 grounded plug and up to 48 events. TP-Link does not state the EP25P4's behavior after an outage.
- Key electrical step
- Keep plugs dry: smart plugs are rated for non-condensing air[9][10]TP-Link rates the EP25P4 for 0-40 C (32-104 F), 5-90% humidity, non-condensing. Use a drip loop on every cord.
- Before time away
- Run any feeder while you are home first; Fish Mate advises 14 days of supervision for a new F14[1]The maker's recommendation, not evidence of reliability.
Watch out for
- Standard air check valves are not for CO2. Aquarium Co-Op says its standard valves are for air pumps only.
- Smart-plug outage behavior is unknown. TP-Link does not say whether the EP25P4 restores its on/off state or runs schedules without the cloud after power returns; check the light after any outage.
- Motor ratings are lower than the headline. The EP25P4 is rated 15 A but only 1/6 HP for motors; the TN311 lists 1/3 HP. Put pumps on a plug only within its motor rating.
- CSA, not UL. Intermatic lists the TN311 as cCSAus (CSA certified for the US and Canada); it shows no UL listing.
- Plants on the surface reduce open water. The 2020 oxygen study found uptake from the air depended strongly on open water surface.
What fits
Product details below are the seller's own description unless a source is shown. Pick the variant named for each item.
Smart plug for the light
Kasa Smart Plug Mini 15A EP25P4 (4-pack)Choose the EP25P4 4-pack. On Amazon, check 'Ships from / Sold by' before you buy; TP-Link's own page links to an Amazon search, not a named seller.
For lights and other noncritical loads. TP-Link rates it 15 A but only 1/6 HP for motors, for non-condensing indoor air, so keep it away from splashes. TP-Link does not say whether it restores its state or runs schedules without the cloud after an outage.
Check price on Amazon Opens amazon.comLiquid test kit
API Freshwater Master Test KitChoose the Freshwater Master Test Kit. On Amazon, check that 'Ships from / Sold by' names Amazon.com or the brand before you buy.
API says it measures pH, high range pH, ammonia, nitrite and nitrate, with seven test solutions.
Choose between the two kinds of timer in mechanical timer vs smart plug, and read aquarium timer load ratings.
Questions
Can I use a regular air check valve on a CO2 line?
Aquarium Co-Op says its standard check valves are for air pumps only and not designed for CO2 systems; it sells a separate stainless-steel CO2 check valve.[5]