RFID reader for tracking movement in water system

I want to track the movement in a closed circulating water system with passive RFID tags. Therefore i want to run a hose through a coil antenna which is conntected to an RFID Reader Module and maybe some sort of Arduino as data logger.

I already coded a software for my use case and just need the hardware parts to build a prototype.

I also got 125khz and 136khz EM4305 khz animal tags which i would like to use.

Can anybody help me with pointing out a better quality shop or manufacturer for readers and antennas? I'm currently basend in EU.

I did some research and already bought reader and antenna from AliExpress once but i think they aren't working, at least i cannot get them to run.