It looks like the 6205 would hold as it has a stronger magnet.
Turbelle® stream 6105
For aquariums from 200 to 2,000 litres
(52 to 528 USgal.).
Flow rate: 3,000 to 13,000 l/h (792 to 3,434 USgal./h).
Energy consumption: max. 45 W.
Voltage / frequency: 100 â€"œ 240 V / 50 â€"œ 60 Hz.
Cable length: 5 m (196.8 in.).
Dimensions: diam. 90 mm (3.5 in.), Outlet: diam. 50
mm (1.96 in.).
Magnet Holder up to a glass thickness of 19 mm (.74 in.).
Turbelle® stream 6205
For aquariums from 800 to 3,000 litres
(211 to 792 USgal.).
Flow rate: 5,000 to 22,000 l/h (1,320 to 5,811 USgal./h).
Energy consumption: max. 55 W.
Voltage / frequency: 100 â€"œ 240 V / 50 â€"œ 60 Hz.
Cable length: 5 m (196.8 in.).
Dimensions: diam. 90 mm (3.5 in.), Outlet: diam. 63
mm (2.48 in.).
Magnet Holder up to a glass thickness of 25 mm (.98 in.).