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I usually change out about 1/4 of the tank every two weeks. I have no nitrates in the tank now and not too many fish. I’m just concerned about the spots on the Pleco which just appeared this morning.

I’ve had a 30 gal fish tank for about 20 years. We are on well water and I have struggled with nitrates forever. The only fish I could keep alive was a Pleco who I’ve had for 15 years. A couple of months ago. I got some great advice and bought a four stage D ionizing filter. It was quite a...

I’ve had this pleco about 15 years and this morning I noticed these patches on him! What do I do?!?!