Yes, I can confirm that rock / pebble rock / gravel will cause the pH to raise over time. My RODI water comes out as around 6.8 according to my pH meter. And I did follow the manufacturer's suggestion to wait 5-6 minutes when measuring RODI water because of the low ion. After adding it to the tank, the pH becomes 7.2 -> 7.4. The highest that I've recorded in my journal is 7.6 but it never goes higher than that. Here is my shrimp's diet: On M-W-F, I feed Bacter AE + Shrimp Baby. On T-TH-S, I feed Shrimp Dinner. And on Sunday, I feed Shrimp King Protein to increase shrimp production. Water change is once a month because I have a ton of floating plants to keep Nitrate low.
@sdlTBfanUK It's probably because of the low quality image so it makes some of the PRL babies' color turn black 😁 But there are no CBS at all in this shrimp tank
That's very interesting. I have read a lot that PH fluctuates throughout the day naturally anyway but it is interesting that your Bee shrimp are fine at PH7.4 as indeed mine were also (although it is normally outside their ideal range)! The PH in my tank started at about 5.5 and then went up to 7.5 over about a year (rock caused that I suspect) but as it was a slow progression it didn't seem to have any affect on them at all!
It looks like you have some crystal black babies in that tank as well?
pH is around 7.4 in the morning and 7.2 at night. I know it's dangerous and easy to have pH swing when you don't have active substrate. That's why I measure pH at least twice a day using the pH meter.
That sounds great and pleased you have decided to go ahead.
As you don't have any occupants in the tank at the moment it should be easy to get the tank parameters right by doing the planned water changes and add very little of the GH/KH+ until you have done the last large water change on Tuesday, that way it is easier to add the GH/KH+ to the level you want directly into the tank then - easier than finding it is over and having to get it down?
IF you were thinking of getting the shrimps from ProShrimp, they have quite a variety, bear in mind that there is postage cost only to a certain value (I think it is £35) so it may be better value to order a few more shrimps instead of paying the postage - if that makes sense??? If you are having them delivered Prohrimp or ebay you need to be home to sign/receive them obviously and IF using ebay MAKE SURE the seller is sending 'Express Delivery (Royal Mail Special Delivery (TM) 1:00 pm)'!
Hopefully we will hear that everything has worked out well and all the hassle hasn't marred the experience.