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See attached. I didn't do water change for maybe more than a year and I am just trying re-aquascape my tank (just cutting plant and do water change). I did water change 2 times last week (about 40% each time). And now that plant (red arrow) is suddenly dieing/rusting. There is 1 guppy is about to die as well. She is pregnant and swim difficultly. I think I did something that messup her spawn?

Is that all these problem due to my big water change? I think it is not because those 2 times have a 4 days separate. and the total water change is just about 0.64% (40% each time, that came out about 0.64% water change total)

Please help me identify the problem.

Thanks.
 

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