Best predator to eat baby guppies? - The Planted Tank Forum
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post #1 of 19 (permalink) Old 04-21-2013, 06:08 AM Thread Starter
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Best predator to eat baby guppies?

I maintain a planted tank in my wife's kindergarten classroom. The children love to see baby fish in the tank, so there are platies, swordtails, mollies and guppies all in the tank. All reproducing readily, but it seems guppies are the most prolific.

I put a blue ram in the tank, hoping it would be a good predator, but I guess it is lazy and happy to eat the flake food, because it definitely isn't keeping the guppy population down.

So in a heavily planted 40 gallon breeder tank, with mostly livebearers, what might be the best fry predator to introduce. Cannot get so big that adult livebearers are at risk, and cannot eat plants or disturb substrate significantly.

I was thinking Bichir, just in terms of the slow growth rate.

Alan
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post #2 of 19 (permalink) Old 04-21-2013, 06:18 AM
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By accounts from a colleague who supported a classroom tank, it was setup with all males which had eliminated the possibility of overpopulation.

Consider rehoming the females if at all possible as an easier course of action. Adding a predator who likely will not limit its appetite to a particular species may create a larger problem where other fish are injured, requiring quarantine, treatment or worse.

of course, others may have different views and opinions so consider this with a grain of salt.

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post #3 of 19 (permalink) Old 04-21-2013, 01:51 PM
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a smaller sized angel or two?
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post #4 of 19 (permalink) Old 04-21-2013, 02:25 PM
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The Toilet?

jk.

I would re home all the females and just keep the males, like stated above. Bag them up and take them to a mom and pop LFS.
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post #5 of 19 (permalink) Old 04-21-2013, 02:29 PM
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If the population gets too big, just scoop out whatever you can catch and donate/sell them to a LFS. Then continue when the population has grown too big again. I agree that angels would work as well.
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post #6 of 19 (permalink) Old 04-21-2013, 03:03 PM
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Angels are aggressive hunters. They will take care of them, but they will also take care of the mollies, swordtails, & Platies.

Thanks,
Scot
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post #7 of 19 (permalink) Old 04-21-2013, 03:06 PM
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I have used bettas to remove small fry, very effective


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post #8 of 19 (permalink) Old 04-21-2013, 03:59 PM
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an african brown knife would do the trick. Slow growwers and very neat to watch. Shouldn't have any problems with it eating adult fish either.
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post #9 of 19 (permalink) Old 04-21-2013, 04:19 PM
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A leopard ctenopoma as they only reach about 6" and will eat small fry.
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post #10 of 19 (permalink) Old 04-21-2013, 04:29 PM
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Best predator to eat baby guppies?

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Originally Posted by fishboy199413 View Post
A leopard ctenopoma as they only reach about 6" and will eat small fry.
That is a really cool fish and I've always wanted one, but I've read that can eat tetra sized fish.
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post #11 of 19 (permalink) Old 04-21-2013, 05:16 PM
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Re: Best predator to eat baby guppies?

What other fish species do you have in the tank? The ctenopoma are also slow growing from what I hear.

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post #12 of 19 (permalink) Old 04-21-2013, 06:16 PM
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Apistos of some sort?
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post #13 of 19 (permalink) Old 04-21-2013, 07:11 PM
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Any fish that its going to be aggressive and big enough to eat fry all day will probably go after the adults for one reason or another. As suggested I would prevent the issue and get rid of the females. The kids will survive not seeing babies

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post #14 of 19 (permalink) Old 04-22-2013, 12:39 AM Thread Starter
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Hmm, black ghost knife, I like that idea.

The leopard ctenoma is also an idea if I can find one.

I've also considered a puffer, to help with snail populations

Mostly all livebearers as described, plus the blue ram, a synodontis catfish( which is over 15 years old), and pond snails, . At some point I will add a bushy nose or otos as well.

Catching them is just problematic with the density of plants, I am looking for the easy solution.

I'm not concerned if they also eat the sword, platy or mollie fry, some will survive.

Rehoming as suggested is not an option, the wife and students all like having the babies appear. The students really enjoy examine the tank looking for new colorful fish, and a constant supply of baby fish keep them interested in the tank.
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post #15 of 19 (permalink) Old 04-22-2013, 01:10 AM
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Best predator to eat baby guppies?

Not sure how big a tank a black ghost knife requires, but they get really big.
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