Set a timer to turn on air pump right before "the mornings"

Hi Bros
I noticed that my fish are gasping in the morning when the lights are switched on and swimming near the surface. They are usually ok when the light has been on for some time.
I believe I have overstocked my tank a little and together with the quite heavy planting, the oxygen probably gets a bit scarce when its the morning. Besides removing some fish/plants, is there any other way to prevent this?
Any help is welcome and greatly appreciated.
Set a timer to turn on air pump right before "the mornings"
colin | The Wilderness and Forest | FTS

that's the way to go.... even better, switch on air pump at night using timer... I have been doing this for my tank which is heavily planted and very overstocked (not recommended :P)
4x2x2 ft tank (2 x 2028 ): Cardinal, Ember and Neon Tetras, Cherry Barbs, Panda, Pygmaeus and Hasbrosus cories, Clown and Coolie loach, L134 and non-ID pleco, Common and giant otos, Whiptails and Yamato, Cherry and Malayan Shrimps
3x1.5x1.5 ft tank ( Eheim 2028 ) Retired
1x1x1 ft tank ( Eheim 2041 ): 2 goldfish

ON the air pump at night. Plant is also breathing (taking O2) so your tank probably start loosing O2 when the light off. When the light on, plant start taking CO2 and producing O2. I assume you did not turn on your CO2 24 hours





Light pump/ co2/ lights would require 3 separate timers though.






Just aim the filter return such that you get some surface movement without breaking the surface water. You should know that plants only supply oxygen as a by product of photosynthesis and only for say 1/3 of the day. What if they don't due to limited conditions as well as the remaining 2/3 of the day without light? You still need the oxygen to come in from the air above via surface movement (just not alot as it can drive off a lot of CO2....CO2 is cheap and you can afford to lose some via turning up the needle valve a tad bit but poor dissolved oxygen level is terrible for fish/critters and bacteria.). Do not focus on saving CO2 and neglect the need for oxygen by the animals and bacteria 24/7!
Regards,
Peter Gwee
Plant Physiology by Taiz and Zeiger

Thanks bros for the solutions. Looks like i need to get another timer soon. In the mean time, I will do it daily.
I have CO2, but turned it off on a hunch due to the amount of fish. Lucky I did so.
Just a side question, is it normal for the CO2 to still be 'leaking' when the electricity is off, but the knob is on? I say this because the CO2 is still bubbling when the solenoid power is off.
Thanks!






It will bubble for a short while only and should stop if the solenoid is in the shut position.
Regards,
Peter Gwee
Plant Physiology by Taiz and Zeiger




Hi angtc, I was worried i have the problem you had now, so, what i did was get a relay and another 3 pin plug. Now once my CO2 cuts or by timer, the air pump start working automatically.


The air pump will cause CO2 to escape from the water. So better to off the air pump when CO2 are being released.
May I know where I can buy a timer with interlocking control?





Hi bros
Thanks for the advice. May I know what is the difference between relay and interlocking? Where can I get them?
Does seem like those are devices that alternate power between 2 sockets so that 1 timer is enough to control?
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