Join Date: Sep 2012
Location: Universe,Milky Way Galaxy,Earth,United States,California
I see you've had good responses thus far. I'm concerned about the 6.4 pH, my tap water is like 7.5 and I've never had any aquatic life kept in anything on the acidic side of the pH scale and I wouldn't dare use bottled water (the actual values don't matter assuming it's within acceptable range for the species in question, but the more important thing is pH stability). Frequent water changes can affect your pH - have you tested your water source? How do you maintain your pH acidity? If they've been living at the pH for weeks, months, years etc., then no worries. Secondly I know nitrates is ideal at 0, and I would look into that a little more. Have you tested your water to see if you're pouring nitrates into the tank? Some other stuff I'd look into is toxins. Aside from something in the water, have you added any kind of algaecides or medications to the water that may be killing off the invertebrates? I know some products warn against using them with inverts. Since I metioned medications, I'm wondering if you are seeing any obvious signs of sick fish/shrimps? Maybe there's a bacterial infection or redness type of indicators on the dead shrimps? I didn't see your temperature listed and I wanted to say one important thing about temperatures. I noticed during summer time, that is the biggest time of year that I see fish death, dogs, cats, etc. I know high temperatures stress out and kill off animals. I don't even run my heaters during summer on my fish tanks because without it, the temp sometimes reaches 80F on the hot days. Lastly, I'll leave off with maybe it's just the end of their lifespan. If the shrimps are all old, it could just be part of life and nothing you're doing wrong per se. I hate this part of fish-keeping and with small pets it usually happens around the 3 year mark. I'd say 5 years is pushing it for some small animals. I hope that helps.