I use the Python mini siphon. Link on my 12 gallon. It goes adequately slow and I bet it'd work on your 5.
The python you linked is the same as mine except mine has a 6" tube and yours has a 12". I went with the one above because it is the smallest I could find. I'm very happy with it. I needed something that went slow because my 12 long has a lot of gravel that needs to be cleaned before taking out too much water.
The python you linked is the same as mine except mine has a 6" tube and yours has a 12". I went with the one above because it is the smallest I could find. I'm very happy with it. I needed something that went slow because my 12 long has a lot of gravel that needs to be cleaned before taking out too much water.