You can slide the ends of the Eheim hoses in some short lengths of scrap PVC pipe, if you have any, for the short term until the paint is cured on the Eheim parts. Or you can tie a heavy rock securely to the ends of the hoses to keep them submerged properly.
I do recommend putting a coarse sponge or the strainer over the end of the intake hose to prevent sucking up any fish, plants or shrimp.
You can adjust the output valve to slow the flow down a bit.
Eheim Pimpette #270
Eheim Pro II 2028; Classics Series -2215, 2217, 2260, 2262; Pro 2229 Wet/Dry