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I'm a fan of barley pellets and hikari algae wafers. I also have fish in that tank, so I'm sure the shrimp get some fish food too.

Hmmmm, make sure you test at the same time of day each time, I have seen similar if I test first thing in the morning. I believe (read on internet, not sure how reliable te sourceS?) that PH fluctuates through the day and night. I got silly readings the first time I did a test in the morning, but when I tested again lunch time (usual time) it was back to normal? I know this goes against everything you are told with shrimp keeping, but if it is 'natural' and probably happening in all tanks (?) then it's probably not a problem, it never affected my shrimp or fish! You could try the same test with the other tank and see if the same happens just to give you peace of mind? IF you did the test the same time of day as previously then let me know and we can have a rethink? On the plus side though at least both tests are in line with each other so they are probably both right/accurate! Don't worry about the PH reading, just make sure you set a regular time like I did for doing the tests, but avoid too early in the day. I can't comment on the film on the water but if it bothers you you could get a skimmer? Most important though, have the shrimp stopped dying? Simon

Ok so problem. 3 days ago I made another water change with ro/di water. The next day I tested the PH, my Ph meter said 7.2/3, API test showed ph between 7.2 and 7.4, which was great! Today I decided to test the Ph again to see if it had remained, and frustratingly the API test shows 7.6 (max on the card) and the meter confirms it at 7.7/8. So I'm stumped on whats causing the water to increase in PH. I tested my RO/DI water just in case, and its Ph is around 7.2, probs closer to the 7 mark i assume. I have removed all the rocks a while ago. I have a couple of cattapa leaves in the tank. The only rock I have in the tank is a small piece of lava rock (which I've read should be PH neutral?) that I use to hold my egg trap down (just a small plastic tupperware container with moss and a plastic mesh). I have taken it out now just in case. Only thing that has been going into the tank arebaby brine shrimp in the last few days, as well as a little bit of infusoria for feeding. My tank has also been having issues with surface film forming, whenever I clear it, it reappears after 3-4 days as thick as before. Its an issue that has appeared ever since i've moved to my new place, im pretty sure its dust. As my new 15 gallon has the same problem and there's no fish/fish food in there. Could this affect the Ph? Also that last shrimplet died today and I assume its because of the swinging Ph. Anyone have any ideas?

maybe I can remove that if I can't I can but that, I didn't know that, it's looks really cool, thank you