I'm pretty good with staying on top of my water changes. I'll be doing weekly tests and I do water changes every night because it is so simple.Great looking tank, I love the driftwood. As for another tank mate, I would not suggest it. Most actually suggest just 2 oscars for a 125g, because they are messy fish - and you have a ray on top of that (which are also messy from what I have read).
I purchased these oscars all together, they were all in the same tank for quiet some time. It is a 100 gallon. The largest oscar is 11 inches long. I wasn't sure if you were talking about tank size or fish size.Oscar's are agressive in nature.You will see lots of fighting that can cause serious damage to each other.
And you can keep any monster fish bigger then oscar .
But since minimum size of tank for two oscar is about 130g so it's better to not introduce new fish in tank.
BTW nice o and what's the size. ?
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I'm pretty sure it's a converted stingray otherwise it's illegal. Freshwater stingrays are illegal in texasI believe the ray is a converted ray. In other words a ray that was originally saltwater fish that has been acclimated to freshwater. Unfortunately because of that the ray's imune system will not work as well as it would in saltwater. Most converted rays never reach adulthood in freshwater. If you want to keep a ray I sugest potamotrygon reticulata or potamotrygon hystrix. These rays are very small, the males rarely exceed 10" in disk width. You would still have to upgrade later on but at least you could keep the ray for a long time.