Just wait ... You've innoculated the tank with both Safestart and some of the good scuz from one of your established tanks so the bacteria are there , they just have to multiply . That small ammonia reading should start to show an equally small nitrite reading in a week or so , then everything will go to 0 except nitrates , and you're good to go . Just check your water chemistry every few days . Sure ... throw in some snails if you can handle the threat of overpopulation . Be patient .