Recent content by Poecilid

I have a 4 inch substrate of light sand. It gets dug up when I'm walking in the tank during cleaning, but I never get any bubbles or odours from it.

Thanks for replies Thanks for all the suggestions about the possible causes of my problem. I'm pretty sure it's not Co2 deficiency, as the fish are also affected. I think I'll have to assume it was a chemical contaminant, but I may never know what.

Meds I've kept fish successfully for fifty years without using meds or water conditioning chemicals. I've used algaecides occasionally... but not in this system.

Water chemistry No, I haven't added anything new that could change the water chemistry. Maybe there was something in the sand I used, or maybe something got into my rainwater tank (which is sealed). The only thing which regularly gets added to the tanks is my body as I snorkel around cleaning...

I have a 1320 gallon water system serving two 530 gal tanks. For the first 15 months the system thrived. Plants grew like weeds, fish grew and bred, and all was right with the world. Quite suddenly, the plants stopped growing. They didn't turn yellow but just sat sulking. The fast growing...