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Instead of a dosing pump you could use an ATU set up, but have the pump running slower, better components instead of the doser running for minutes at a time?
Will there not be a siphon break once the water drops below the siphon tube?
You'd need a way on removing sediment from the bottom of the phyto and zoo chambers.
Cheapest place I could find those caps was here
I ran across the Zinn Plankton reactor in a description of one of the older TOTM (June 2003) threads. It appears to be an elegant way to culture phyto- and zoo- plankton in the same device. It's basically a small tank, divided in two, with a small mesh screen in the divider that is too small to pass either zoo- or phyto- plankton (n.b. - won't pass EITHER culture). On the phytoplankton side, there is an air-lift pump constantly pumping a small amount of the phyto culture through a second, suspended mesh screen that is large enough to pass the phyto, but too small to pass any zoo. This airlift provides circulation, promotes gas exchange, and by passing the output through an elevated (out of the water) filter, will trap and kill any zoo- that find their way into the wrong side of the tank. On the other side of the divider, the zoo culture is active. A second airlift pump will periodically pump some of the phyto culture over the divider and into the zoo side, to keep them fed. Waste byproducts from the zoo side will pass through the ultra-fine filter in the divider and act as nutrients for the phyto. With the addition of light for the phyto, and a small amount of fertilizer (orchid food appears to be recommended), the system can supposedly run continuously for months, maintaining a healthy zoo culture (which can either be manually exported to a display tank, or connected by another airlift pump on a timer, if the culture can gravity feed into the display).Caveat--- this is all based on my best efforts with google translate and some older thread searching. I plan on giving this a try (in a 5 gallon tank in the hood of my display) when I get my new tank set up, but can't vouch for it.Here are a few of the links I mined for this information:ZC-Aquarientechnik PlanktonreaktorArtemia und PlanktonreaktorenTank of the Month - June 2003 - Reef Keeping Online
I made this earlier:It uses the return to push water slowly through some airline tubing as a drip feed to an ice-cream tub, which will contain rotifers and pods. As it reaches the top, the surge starts and drains about a fifth of the tub into the DT. Hopefully, this will act as a water changer, and auto feeder, but will leave and eggs and never feed all the rotis/pods in one go. If I get the balance right,I hope to leave enough behind to allow for the culture to last a good while before running out. I will add concentrated phyto as food source, which will also partially get surged out, so will add a bit more than required, and it will dose the DT too
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