I have had a lot of turtles. Few things...BARE bottom has been great for me...very easy to suck up poo IF it even stays. Also LOTS of mech filtration. They are messy eaters and poo big bombs (if its a bigger turtle) so I like to have good mech filtration as well as bio. a FX5 wouldnt be too much for a 100 gal if you ask me. The bigger it is the more if filters and doesnt clog and need cleaning every week. I use internial filters for baby turtles...once they get big the internials clog I find.
If it were me I would drill the bottom of the tank so you can have a set water level that you want in the tank. Bio in the wetdry and canister for mech filtration. The wetdry will also not allow the water to drop as it evaps. Since the tank wont be full it helps keep the glass nice and clean...not multi water lines down the front of the tank.
I have a ehiem 2215 on a 20gal tank with my 1yr old snapper that is about 4" in shell.
Theres a thread where you can get a fx5 for like 220 too....
If it were me I would drill the bottom of the tank so you can have a set water level that you want in the tank. Bio in the wetdry and canister for mech filtration. The wetdry will also not allow the water to drop as it evaps. Since the tank wont be full it helps keep the glass nice and clean...not multi water lines down the front of the tank.
I have a ehiem 2215 on a 20gal tank with my 1yr old snapper that is about 4" in shell.
Theres a thread where you can get a fx5 for like 220 too....