So I have to leave my External filter in water o.0?
LOL, NOT THE WHOLE THING. Just the filter MEDIA. Crikey this thread is spiralling.
Dunno, not had hands-on experience with like (like nry with the other stuff). 5mm would be maybe too big ...
Why can't things be simple aye? You'd THINK all this stuff would be in the LFS's, but it just ain't (well, it may well be, ask). You have to search it out and this makes plant keeping so much more painful, esp on an international forum. Most stuff you need can be found in garden centres actually....
Andy