I know, I know... i shoulda thought this out sooner. I went to clean the gravel in my divided bookshelf tank with my siphon vac and its just too big to get in there

so i did a water change with a styrofoam cup (thanks for the idea CWC) but i wasnt able to gravel vac and that's not a good habit to get into. SO...... how do you do it?
2nd question: One of my bettas doesnt eat very much, he just takes it into his mouth and "chews" on it for up to 45sec and then spits it out. he only keeps 1 pellet down at each feeding twice a day, but he'll eat blood worms just fine. so should i buy different food or just give him a few days to get used to this brand. the other betta loves the pellets so i dont know. in case it matters, all water parameters are 0 ammo 0nitrite and 5nitrate temp is 80*
Thanks for the help, just trying to be a good betta daddy
