Tetra for Hard Water - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 9 Old 11-03-2006, 07:08 AM Thread Starter
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Tetra for Hard Water

Hi there!
I am keeping mollies right now on a 15g heavily-planted tank. I've been fascinated with tetras but found out that I couldn't keep them on a hard water aquarium :( so I opted for mollies. But I still tried researching what tetra can I keep on a ph of around 7.5. I only found the Royal Black emperor, not even sure if we have it on our lfs.
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post #2 of 9 Old 11-03-2006, 06:19 PM
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There are tetras recommended for beginners that might suit your tank water conditions. Lemon tetras and beacon tetras are a few I can mention.

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post #3 of 9 Old 11-12-2006, 04:07 AM
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Most tetras do plrefer acidic water, but, if accustomed gently, most of them can get used to harder water too. I don't have any tetras now, but I have Rams, which prefer a lower ph and acidic water, but my ph is nearer 8.0! Just an examply of how they can adjust with time.
Good luck. :D
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post #4 of 9 Old 12-27-2006, 09:28 PM
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Red Eye Tetras are hardy but nippy.

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post #5 of 9 Old 12-28-2006, 01:38 AM
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Check with your LFS to find out what their pH reading is in the tetra tanks. Many species of tetras are now being bred in harder water, up to 8.0
The LFS where I worked kept most tetras in 8.0 and they did fine. The water we tested that they came in was always at least 7.6 or higher when the fish came in. We talked with many of the wholesalers to find out what they had for water params, and red eye tetras, red phantom, black phantom, serpae, diamond, black skirt, white skirt, and even neon tetras were all thriving at 7.6 or higher.
Our diamond tetras did much better in the harder water, and even our congo tetras did well.
Considering the size of your tank, have you considered rasbora het? Those also can thrive in up to 8.0 I have a few here now being kept at 7.8 and they're 3yrs old and thriving.

Dawn Moneyhan
Aquatics Specialist/Nutritionist
Juneau, WI
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post #6 of 9 Old 01-03-2007, 09:52 PM
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Hmm hard water Tetra

I seem to remember someone told me the other day that Congo Tetra's prefered harder water...?
Anyone know if that is true?
I'm facing a hardwater tank too. Our tap water comes from a nearby lake, and nearly all of central texas is old seabed/limestone, and that naturally means hard, alkaline water. Although it is better now at pH 7.6-7.8 than it used to be when the town was on a well...that water was worse. It also used to come out of the tap hot, which I never found the reason for.
Sorry, I tend to ramble, LOL...
I have a 10gal cool water tank with white clouds and a couple of peppered cories and a 55 gal that, so far, has only 4 mollies and 3 very small peppered cories. Still deciding what the 'final' product will be...am considering some rift lakes fish, but don't know if my mollies and cories would be at home in a rift lake tank...Hmmm? Hubby hints that I should adios the 10gallon since I got the new 55gallon for christmas...hehe...NO WAY! Always room for more
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post #7 of 9 Old 01-03-2007, 11:04 PM
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Hi and Happy New Year!
I would have to say that congos would prefer the softer water if given the choice. They are pretty sturdy fish, but some things they just can't adjust to, and a pH of over 7.8 would be something they would struggle with.

As for the rift lake and mollies... it's not the environment so much that I would expect them to have a problem with, I think they could be acclimated over just fine if it's done slowly enough, but what other fish are you considering keeping with them?

The most common rift lake fishes are cichlids, and these can NOT be mixed with mollys. Mollys and small cories would simply become food.
I'm not sure I would try rift lake conditions with the corys tho, I doubt they would survive for too long that way. Corys would prefer softer water than what rift lake conditions allow for.

Tell hubby that there is no such thing as too many fish :o That simply doesn't exist I'm at my bare minimum right now at 26 tanks. (I have recently taken down another 4) Once we get moved and settled, we'll have 100+ tanks! :D

Dawn Moneyhan
Aquatics Specialist/Nutritionist
Juneau, WI
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post #8 of 9 Old 01-03-2007, 11:27 PM
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Ugh. So, it is either give up the idea of rift lake fish (cichlids) or rehome the little guys. Even the herbivores would be problematic?
What other types of fish would do well in pH 7.6 hard water though?

Hmm, sorry for highjacking the thread, btw.
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post #9 of 9 Old 01-03-2007, 11:57 PM
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Yes, even though rift lake cichlids tend to be more herbivore, they will still eat smaller fish, and are highly aggressive and territorial.

You could work with other livebearers, you could work with various species of tetras, and at 7.6 you could even work with things like cherry barbs and gold barbs. (these are much less aggressive than other barbs)... and even dwarf gouramis can do just fine at 7.6

Here, we raise most of our tetras and all of our barbs, livebearers, and even some of the rainbows in water that is 7.6 - 8.0 and they do just fine. Sometimes its a matter of knowing what water params they are coming from and acclimating them slower.

Dawn Moneyhan
Aquatics Specialist/Nutritionist
Juneau, WI
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