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I mixed RODI the other day to 200 TDS. I did my water change today, 10% (about a gallon) and slowly dripped it in. I believe the tank TDS has raised to 219 by last night. The TDS measured has raised to 222 after I slow dripped half gallon of mixed water into the tank. I was concerned so I stopped and now have it at straight RODI water. I hope that is ok and not cause any issues? I noticed some of my shrimp zooming around, some of the older, larger ones. I think I saw a female with green eggs earlier in the day but I haven't seen her since. Then there are some still picking away on the sponge filter. I think I'll have to test it. Nothing happened during the original vinegar test but can never be too sure, especially if the parameters are changing. Thanks! This is not my first planted tank but it is my first planned from the ground up aquascape. I wasn't sure how it would all come out but overall, I have to say I'm pretty pleased with the outcome. Just need to get that filamentous algae under control. I was able to add in the dwarf water lettuce last night.

It will be a good idea to test the rock as crabby suggested. I see from the photo of the tank that it has no cover and that may mean you are gettng quite a bit of evaporation, which will raise the TDS as evaporation is purely water. Top ups should be pure RO water to correct this. Adding new/clean water usually encourages activity like molts and breeding etc - in nature I assume that is what happens after rainfall! I hope you see more carrying eggs and soon get some shrimplets and pleased to not hear of any deaths this far! I have had algae when setting up new tanks but it has always died off/vanished once the tank is stable and has been running a few months.