From what Ive heard they really like fruit flavors(seems to be the case with mine as well. I dont think there is one flavor that will cloud the tank more, just depends on how much you put in. Considering two clouded my 30g, you might wanna start off with 1/2 of one for a 10g. But remember, the clouding does not hurt the tank at all. As far as veggies I have not tried squash yet, always forgot to get some when Im at the grocery store. Mine seemed to love spinach leaves alot.