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Can water be too hard for guppies and cherry shrimp?


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Hello everyone,

I’m getting some new guppies and cherry shrimp in. The tank I’m planning on putting them in is a 29g which has been up and running for over 2 years and seems to be cycled. I tested the water today, PH was 8.2 ,no ammonia or nitrite, and 10ppm nitrate with a GH of over 215.8ppm and a KH of 196.9ppm. I tested the KH and GH straight out of the tap and had the same readings. Is this too much hardness and too high of a ph in the water that would be harmful to the guppies and cherry shrimp???

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My tap is liquid rock gh never below 250-300 lol. Even my water softener barely dents it. My ph 7.6-7.8 my neo shrimp and guppies thrive. My understanding guppies thrive up to 8.4-8.5?  I know I spiked once and my guppies loved it.  Not sure what shrimp can tolerate but I know slowly they can adjust to a lot. Depending on source water they were raised in. 

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On 6/24/2021 at 3:55 PM, Guppysnail said:

My tap is liquid rock gh never below 250-300 lol. Even my water softener barely dents it. My ph 7.6-7.8 my neo shrimp and guppies thrive. My understanding guppies thrive up to 8.4-8.5?  I know I spiked once and my guppies loved it.  Not sure what shrimp can tolerate but I know slowly they can adjust to a lot. Depending on source water they were raised in. 

This has also been my experience.

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My cherry shrimp live in about 258ppm and seem to do just fine. My snails were doing weird things and I put a wonder shell in there to see if it would help, it dissolved in less than a week. My hardness went up to about 340ppm and about a week later I had 2/10 cherrys die. I was looking online to find out why the sudden cause of death of two. I was  finding that if the calcium is too high the shrimp's shell is strong and they cant break it to molt.  I also found LRB aquatics where he referenced that he was not doing water changes, but only topping off with hard water and the shrimp were having a hard time molting. 

once I did two large water changes to get my parameters back to normal and have not lost another shrimp yet. I have seen lots of molts and I even have babies on the way. 

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