Dont want to come off as mean, but i sure hope you have plans for an upgrade in the nearish future with all those fish...
Most rays from my understanding require tanks with a much wider footprint than a 100 gallon can provide...
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Thats a great first effort, like others say tho there is a good chance the oscars will be too much for a 100g when they are fully grown without the ray!-) oscars have been known to reach 18inch although 13-14 inch is more common. im guessing when you say you set it up 3 days ago you mean added fish as it should have been set up for a good few weeks and allowed to cycle?
It really is one of the best newbies tanks ive seen though, and keep up with them waterchanges as rays need pristine conditions or you may lose him her.
I 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.
I'm pretty sure it's a converted stingray otherwise it's illegal. Freshwater stingrays are illegal in texas
I am thinking of adding one more fish to the group. Any suggestions anyone?
I heard the florida stingray is born in fresh and throughout it's life goes from fresh to brackish and then from brackish to full salt. Those are the only freshwater ones in the store. What store did you get them from theres one that I know has them and keeps them freshwater when they are small?
Nice tank...
It is true you can overcome overstocking with more water changes and more filtration to some extent but you have some heavy waste machines there!! lol
The ray you have is a converted ray and can be VERY difficult to keep in fresh long term, there are populations in the wild that live in fresh so it is theoretically possible but that being said not only may it stress easier but from what i have read because they are in fresh they actually produce MORE waste do to the way there physiology works... Monitor the tank very closely any signs of stress from him and do a HUGE water change. Also you may want to think about adding some salt to the tank, shouldnt bother the oscars at a tablespoon or so per 5 gallons but will help the ray.
Good luck!