With the Boyu filter's O ring stretching I decided to ditch it rather than search the world for a new O ring. I bought a Resun CY-20 for £17 including shipping and so far it is better in both appearance, setup and function than the Boyu EF-05.
The inlet 'crook' was long enough for my 80cm tall so I had to cut that down and then put the strainer on it as it would have reached up a foot above the rim. It is positioned into the right rear corner.
I have seen some complaints about the small spraybar and it is small at about 4 " long but it is absolutely spot on for this tank. It is positioned on the right hand pane. If I wanted it along the back then the Boyu spraybar will fit as they are the same diameter pipe.
It was also much easier to prime than the Boyu and was up and running without the splutters of the Boyu which used to take a good hour or so to remove the air.
My favourite improvement is that the hoses actually fit inside the tighteners when screwed tight. The boyu's hose tighteners would not fit over the tube and therefore you either didn't tighten (just pushed the hoses on and hoped for the best) or you used them to remove the hose.
Its actually quite a pretty filter and the output seems to be pretty consistent.
Beware if you want to use glassware on this filter that the intake hose is larger than the outflow.
However those issues with the Boyu and possibly also the Eden (Garuf) being not up to the lph stated seem to be addressed here with this filter. The intake and hose diameter being 12/13mm allied with the output and hose diameter being 10mm seems to mean that more water can come into the filter whle the outlet diameter allied with the short spraybar pushes it out nice and fast.
AC