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Thank you for your help, will put in a flat rock today. Have checked the PH and it is fine, there is no real coral in the tank it is a coral look-alike rock. They have removed all sand and gravel...

There is one male in the tank, and only the one female. They have formed a pair. The aquarium has sand and gravel on the bottom, a couple of rock structures, one is tall and coral like the other is...

I think my female oscar is pregnant but unsure how to tell. She is very fat on her underside from chest area to just before her tail, she has been getting fatter and fatter, is she pregnant, if so...