you definitely need a tube. you need a way to pull out about 50% (or more) of the water in your tank in order for an effective water change about once weekly. for me, i just got the siphon like the link i gave you, and siphon the water out into buckets, then fill the tank back up with buckets (either dump the buckets right in or siphon the water in).
this is more along the lines of what you want: Gravel Cleaner - Small - Maintenance - Gravel Cleaners at BigalsOnline
this is from BigAls, from the link you just posted. i'm assuming that is where you are purchasing everything. never used this brand but looks very similar to mine.
this is more along the lines of what you want: Gravel Cleaner - Small - Maintenance - Gravel Cleaners at BigalsOnline
this is from BigAls, from the link you just posted. i'm assuming that is where you are purchasing everything. never used this brand but looks very similar to mine.