GuppyGirl made a couple of homemade gravel vacs. She used a small diameter siphon tube and a small, but slightly larger hard plastic tube as the vac. One can tape (shipping tape?) the exit tube of an UG filter or sponge filter. Also one could connect the right sized flexible tube to the small part of a turkey baster. (The bulbs on basters wear out after so many years.) There are a couple of those tubes around here awaiting either use in the fishroom or recycling of the usual sort.
GG made me an even cleverer mini-vac and it is still with some stuff, moved when we had new windows put in the fishroom. I've got to find that, use it and maybe post a photo.
Those small-scale vacs require more patience of one because less water flows at a time. But Betta bowls & vases - if I don't get swatted around for suggesting that ;) could actually be cleaned that way, as could graveled 2.5-gallon tanks. Just think, a fish bowl vac. And with the lower volume, it is safer for fry too. :)
I can just see people lugging the plastic ends of turkey basters into pet shops or that rack of tubing on a pipe at the hardware stores, looking for a fit. :0
All the best!
unc
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