Suggestions for 2 barriers in a 125 gallon separating large turtles from baby turtles and fish

[Irecruitfish]

The fish will come and go but this will be the turtles home. In the past I used egg crates in a 125 but I feel like they were difficult so looking to hear some other suggestions?

 

[FJB]

It probably is already too much wit the large turtles alone….. no separations, no extra biota.

 

[Irecruitfish]

It probably is already too much wit the large turtles alone….. no separations, no extra biota.

They are not large turtles but 5" and then one baby turtle