IME they are not, but other people might have different experiences I have had 2 new tanks each with a dwarf gourami and the gourami was happy and healthy..... And, plus, IMO dwarf gouramis ae more attractivedwarf gouramis are really sensitive to new tanks
How about 6 to 8 harlequin rasboras, 6 to 8 neon tetras or cardinal tetras, 1 dwarf gourami, 3 to 4 amano shrimp and 3 to 4 male guppys or male endlers