This depends on too many variables.What kind of tank?Glass or acrylic??If glass are all the seals like new?? If acrylic how many scratches??What kind of pump?? what kind of lighting??The CC will/should end up in the trash can(use sand)and the nets also dont matter.So I really couldn't say for sure.But if it's all top quality stuff,it could be worth over $$800.If it's cheapo stuff,,,maybe $200-300.....