Eggs collected from the Congo spotted pufffer

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Puffers typically have really good eyesight and wiggling eels should get their attention.
vinegar eels are a much easier live feed to keep active.
 
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I'm not a puffer guy, no experience with them, so take this with a grain of salt...but whenever I happen to have a "surprise" brood of small egglayers like this, I find that a good handful of oak or grape leaves tossed into the tank produces infusoria quickly enough that by the time the fry have absorbed their yolks they have a supply of food available to them. Not ideal, not the greatest for water quality; plan on frequent changes. Using a sponge filter in the tank is 100% safe for even the smallest fry, and acts as a substrate for more microbes as well. When changing water, siphon from the open water near the top, rather than disturbing the "microbe factory" of leaves and debris on the bottom...once euphemistically referred to as "mulm". :)

The hard-boiled egg yolk thing is also good. If you take a small piece of this, wrap it in a piece of clean/rinsed cotton fabric from an old T-shirt or similar, and then squeeze it in the tank, it produces a cloud of tiny particles to serve as food. This method is easy to overdo, resulting in very fouled water, so caution is required and water changes are mandatory.

With most species it only takes a few days or a week for the fry to grow large enough to start eating baby brine shrimp or powdered commercial foods.
 
New update.
Tested water parameters, the Amazonia was 0 , nitrite was spiked and nitrate was very low.

carefully with the use of syringe pump replaced two litres of water to bring down the nitrite .
Did not have the vinegar eel culture, so I found someone who had and I bought it, as soon as she knew that I needed it badly, I was charged more for it. I came and placed some vinegar eels into the tank. Because both the vinegar eels and fries are small I cannot see if they are eating. But one thing I noticed after observing that the fries some of them increased in size meaning grown a bit. I don’t know if that is because they have consumed their yolk or they have eaten some eels. I counted there are around 180 of them moving in this 10 litres tank. Some of them bigger than others. I am trying to get some pictures to post here.
 
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