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I don't know what kind of vacuum you have but some of them have a flap or valve type thing in the area where the large tube (hydrocleaner) and smaller tube connect, it is in the large tube part,(hard to explain, so sorry) anyway, I remove that flap/valve because they tend to stick sometimes and won't work right, you have to separate the two pieces to get to that valve and I used a pair of needlenose to break if off. Just a thought...sometimes you can fix some things or rig them so that they will still work, I hate spending money...laffs.....yours may not even have one...
For a new one, I am not sure of brand names but I know they have pretty small siphon type cleaners just get the smallest diameter one so it will work on all your tanks.
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