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DIY project: my 20L fry tank

 

An Article by Frank Panis

This is the report of the installation of my newest fry tank. Although this kind of setup is useless in a normal living room through the splashing and high water evaporation rate, I thought it might be useful for giving people an idea of how to install a similar, yet more perfected smaller tank connected to the main tank for raising fry.

When you have a female holding and you desperately want to raise the fry, it's time to have a fry-raising tank. Don't get tempted to keep the mother and the fry in a net or floating breeding cage, as this is very stressing for them. No, they deserve a separate miniature tank: for the female to release her fry, after which she can be put back in the main tank, and for the fry, so they can grow up and enjoy a carefree youth. 

The immediate reason for me to install this unit, were a bunch of high quality fry (Protomelas spilonotus 'Tanzania') swimming in the filter. It would be a shame to not catch them out and raise them. They already survived the trip from their mothers mouth to the filter, so the hardest part was already behind them.


The 20L/5G acrylic tank located on top of the trickle filter of my 3000L/800G Hap tank in the cellar fish room. The main principle - the same as that of a central filtration system in a fish room - is that this small tank is connected with the large tank, so it won't suffer from bad filtration and unstable water chemistry that is very common in such small tanks, especially when it's combined with a tight filtration system. You can feed the fry without having to worry about the water quality deteriorating too fast, what's a key element in raising them fast without growth retardation and severe losses.


The little aquarium after some modifications...The tank was setup in 10 minutes. I took an old acrylic goldfish tank and drilled an outlet hole on one side. I've put it on its place after which I covered the bottom with a small amount of sand. Then I've put a crude filter sponge in front of the outlet hole and fixed it with a midsize rock. First I hooked up the canister outlet, but this caused the little tank to overflow. A separate small pump did the job much better. Another sponge was installed at the outlet to prevent splashing.


A clear difference in fry size after just 3 weeks


Detail of the sponge at the outlet to prevent splashing & the fry picking food from the bottom.

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