Nerite snail question - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 03-05-2018, 03:23 PM Thread Starter
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Nerite snail question

Could you please take a look at this photo? Is this normal shedding or molting of the zebra nerite shell or does it indicates a calcium deficiency or soft water problem or something else? The dark spot was not there when I got it a few days ago. I have some cuttlebone in the tank and put some calcium and magnesium in the water to raise the hardness by a few degrees. Thanks.
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post #2 of 13 (permalink) Old 03-08-2018, 08:15 PM
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What dark spot are you talking about, where the yellow lines stop? That looks natural and long term to me, given how smooth the shell is. Are you sure it wasn't there a few days ago?
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post #3 of 13 (permalink) Old 03-08-2018, 09:10 PM Thread Starter
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Thanks. Yes I was talking about the area where the stripes stop. I did not think that this spot was there when I got the snails a few days before, but perhaps I didn't notice it. I am watching the snails because two of them are now inactive, not moving for a few days running and have fallen off the glass on their backs. I was concerned that the water is too soft for them and I do run CO2 during the daytime. But I just checked the GH and it looks to be about 10. KH is about 4. PHs about 7.0.
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post #4 of 13 (permalink) Old 03-09-2018, 08:01 AM
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That appears to be a natural shell feature, though an odd one. I had a nerite that had stripes running one way, then suddenly began growing at a different angle, so odd patterns do occur sometimes.

As for your nerites landing on their backs, you should turn them upright immediately since nerite snails cannot right themselves from that position and will die if not turned over. I'm not sure why they would have just fallen off the glass in the first place, though. That seems strange to me.

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post #5 of 13 (permalink) Old 03-09-2018, 09:43 AM
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its face-lift model
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post #6 of 13 (permalink) Old 03-09-2018, 11:01 AM
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Both of my nerites have the same pattern change as yours. No biggie.
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post #7 of 13 (permalink) Old 03-15-2018, 05:07 PM Thread Starter
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I'm continuing to watch the two that are not moving. They do not smell yet so I suspect they are alive. They seem to be white opaque under the shell instead of more grayish as when u see the pod stuck to the glass.
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post #8 of 13 (permalink) Old 03-15-2018, 05:13 PM
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You using RO water?
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post #9 of 13 (permalink) Old 03-15-2018, 05:15 PM Thread Starter
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No! New York City tap water which I am supplementing with some calcium and magnesium to make it a little harder
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post #10 of 13 (permalink) Old 03-15-2018, 05:57 PM
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Hmmm. I'm using RODI remineralized to GH 7, KH 3-4, and snails die typically within 48 hours of introduction to both my tanks running that water. Cannot, for the life of me, figure it out. Had to put all my nerites and MTS in my sons 10 gallon tank running tap water.

One of my thoughts was the magnesium sulfate actually causing a problem because of how it regulates osmotic pressure...or something like that. How much Mg are you adding, and I assume you're adding MgSO4.7H2O(Epsom salt)? I started a post about this actually a month or so ago, a couple people agreed that the Mg might be the issue, but how does one rectify that? Lol. Perhaps a different Mg salt...but obviously you need Mg with the Ca, otherwise you'll have unhappy plants.
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post #11 of 13 (permalink) Old 03-15-2018, 07:13 PM Thread Starter
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I am putting about a half teaspoon of calc chloride and a quarter teaspoon of Epsom salts with every 5 gallon water change, about once a week. Do you tell me if someone is saying that this is harmful to the snails. As you indicated I am doing it for the plants and also to bring up General hardness of the water for the snails and shrimp.
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post #12 of 13 (permalink) Old 03-15-2018, 07:15 PM Thread Starter
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Thought I would put a better photo of the ones that aren't moving. I have kind of placed them against the glass for easier viewing. And here's a photo of the third one that is clearly still moving around on the glass.
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post #13 of 13 (permalink) Old 03-27-2018, 01:30 PM Thread Starter
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update - these two nerites died. One morning their shells were just cleared out and apparently eaten by shrimp. There are little pieces of some part of the snail lying next to the shells - I don't think it's the soft part. The third nerite is still chugging along.
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