thank you sir , i an a beginner even do i used to have a lot of fish tanks but that was over 10 yrs ago i just pick it up again . so i just did a 75% or a lil more change of water and that their is a huge diffrence in color i know is not goin to be crystal clear for while but i coulndt stand that black water any longer ,know i have two female gupis that survive out of ten that my freind gave to me they are a lot more happier it seems now or meaby i couldnt seem them before lol . i didnt touch the filter is over hang penguin 350 , im planning on buying another one , iwanna make this tank a comunity tank so granddaughter can enjoy it even do she loves it , so once again i appreciate any and all your help that could give e