Looking for a killer - tiny and efficient - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 9 Old 07-17-2008, 02:19 AM Thread Starter
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Looking for a killer - tiny and efficient

Hi guys,

I am planning a new tank in which its inhabitants should feel well enough to get it on right in there. My problem is that this tank will be focused on a healthy ecosystem rather than fish, so I can absolutely not afford any fry to grow up. I don't kill fish or dispose of them in any other ways than the natural ones. So I guess my question is: are there any small but capable predators out there that prey on baby fish but not on small grown ups, and thrive in soft, slightly acidic water? The tank is only 24"/15gal, so size is important.

Any input will be greatly appreciated.
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post #2 of 9 Old 07-17-2008, 12:56 PM
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I have some golden wonder killifish that are great at eating guppy (and hopefully swordtail) fry, but they get to be 4-5" so they might eat some of your adult fish. I wouldn't even trust them with my adult guppies. What sort of adult fish are you planning on keeping that will be doing all of this breeding?

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post #3 of 9 Old 07-17-2008, 11:03 PM Thread Starter
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I haven't quite determined yet because I have to test my tap water a little more (readings have been inconsistent), but it will be killies or guppies/platies, I think.
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post #4 of 9 Old 07-22-2008, 11:40 PM Thread Starter
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I've done some research on the golden wonder killi, and I would looove to have one. Unfortunately, he would probably also eat the adult guppies and my shrimp.
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post #5 of 9 Old 08-03-2008, 10:27 PM
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adult fish will eat most, if not all of the fry. problem is if there are any that find a decent hiding spot they will have that "chance" of growing large enough but in a 15g id say they most like are food unless its heavily planted or has lots of hiding spots.

whats wrong with buying only female guppies or even better only males because they are more colorful? LFS usually have males and females seperated into 2 different tanks so you really dont need to worry about choosing and already pregnant females. if not you can see black gravid spots on pregnant females and if looking for males, they tend to be smaller, more colorful and more importantly they have a "tube" by their anal fin.
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post #6 of 9 Old 08-04-2008, 11:36 PM Thread Starter
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Nothing's wrong with only males, but a guppy's purpose in life is to have as much sex as possible (like English Lit students). And I do not want to take that from them. But since my pH has gone down and remained stable at 6 (with 2 deg. gH), guppies are out anyways. It's going to be killies and dario dario all the way.
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post #7 of 9 Old 08-04-2008, 11:43 PM
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hmm interesting. what caused the pH drop? driftwood? and as for the egglayers you really are good with having to worry about them reproducing.. they usually need just right conditions to be interested on mating, and if they do, its easy to scoop out eggs or they usually end up all eaten before its even close to them hatching. goodluck with your "ecosystem" deal and update us on how it goes!
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post #8 of 9 Old 08-05-2008, 12:00 AM Thread Starter
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Thanks, I will. As for the pH drop: Portland has extremely soft water and in my area a pH of around 7. Needless to say, there is little buffer capacity. I have only driftwood, no rocks, and I also feed CO2. I assume these things to be the main reason for the lower pH.

I will see what I can do about the fry. I'm planning to keep clown killies and dario dario. Should there be fry, it shouldn't be a problem to sell them. My LFS has already expressed interest in buying the clowns (they are currently importing wild catches).
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post #9 of 9 Old 08-05-2008, 12:20 AM
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well thats good you have a place to get rid of them should there be a baby epidemic and from my experience driftwood seems to lower pH
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