I received a 90? gallon tank from my friend. It is a saltwater tank. It was my friend's husbands tank but he passed away and she didn't know much about it so she was giving it away. No one took it so I did. There are 3 tomato? clown fishes. Everything is set up but the filter. She gave me everything, including a fluval 404. I have tried setting it up but ijust can't seem to do it. I got back from the pet store a while ago to ask them how to set it up. I did what they said, but it just wont start. Can anyone help?