are you using carbon in your filter ?
If you cant afford the uv, I understand ... I would add a second filter with 100% polyfil, this will help' pull out all the green yuck, do NOT add any ferts I dont think you have enough plants yet to worry about that and you should get rid of the green water 1st . I HATE GREEN WATER, AND I understand how frustrating this all is . HTH and GOOD luck , ALSO the 3 day black out works well too !!! ~~~~~ do BOTH , add polyfil, and throw a dark sheet on the tank for 3 days . I bet that helps. also dont worry about feeding fish during black out they will be fine . good luck !! let us know what works for you