Old CRS tank not as vibrant as it once was
I have about a 3 year old 2.5 gallon CRS tank that has done very well, but lately I'm not getting the breading I used to, and the shrimp numbers have declined slightly.
It was setup with Aquasoil, and I think that it may be expired.
How would I go about replacing it? Any other tips to renew an old CRS tank?
Current work in progress:
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