I have a 4 foot tank and have not got a filter yet,what would b the best size 1 to use as i dnt have any fish in my tank and the water is very merky!! and when i get my red bellys and put them in i dnt want them dying?? thank u robert :laugh:
Im going to assume by 4' tank you are refering to a 55 gallon. I like canisters so I would get an eheim 2015 for biological and probably add a ac500 for a couple reasons. They are good at polishing the water because of the high turnover and also, should you need a hospital tank or want to set up a new tank you will have a cycled filter.