Fish and Turtle in the same tank

[idkanythingabtfish]

hi, I have a comet and a shubunkin goldfish( not sure if that’s exactly what they are, but it seems like it based off looks) and a 2 year old red eared slider. I was wondering if it was okay to keep them in the same tank and if so how big should it be ?

 

[Barry Tetra]

I won’t recommend have them in the same tank, turtle can get aggressive sometime and may bite goldfish, another thing is that fish medication cannot be used with turtle.