Gardening Assistance

So my poor precious tomato sprouts are getting slaughtered! Every day I look at them and it seems like there are more bites taken from them. I sprayed a solution of some drops of liquid dish soap and water on them yesterday and then today after it had rained a bit. My next solution will be this recipe:

~1 whole garlic bulb
~2 cups of water
~1 gallon of water

I got the recipe from this website: 12 Homemade Natural Remedies for The Vegetable Garden . It's just so frustrating, I don't have any fruit yet and they seem like they're going to die before they even begin! The potatoes seem untouched, in a sense. I'm just trying to stay away from anything "toxic" so to speak. If anyone has any better advice I'd love to hear it. Oh! But I don't use any dairy or anything like that, I know I saw a recipe with dairy milk in it. No thanks. I've also heard that seaweed is good for plants and can keep some bugs at bay, is this true? Because that'd be pretty sweet, the nursery here has a premade spray that contains seaweed.