Hello all! Quick background I have been doing cichlids for about a year now have a 125 with a Wet/Dry on it and a 55. Have also been breading them so im used to daily water changes and such. Now like any hobby/addiction i need to step it up. I think its time to give marine a try. I have a 40 deep breader and a 20 that I was useing for the cichlid babies and I would like to make it marine. The guy i get my cichlids from said I can ONLY get a DI system without the RO part and be just fine. Is this true? I am on city water in the DC area so they put ALL kinda of chlorine in the water. I am having the 40 drilled with a Overflow and using the 20 gallon as the sump. And if you can recommend a good skimmer for the sump as well. THANKS!!