Fish are keep dying

I dirt my tank two moths ago, I had brackish water for couple of days but it was clear afterwards. Everything went fine for a week and two then I got ich in the tank. I treated the tank after loosing three fish and rest of the fish were quarantined. I am having a huge problem now as my fish are keep dying every second day. I am doing water changes every week. I tested the water everything is 0 but ph is a bit low. My lfs says that dont do big water change its causing ph decrease. I dont know what to do but really hating the idea to dirt as my healthy tank is now a disaster. I added dual t5 on this 35 gallon dirted tank and now getting a white kinda layer on the glass which goes away if I rub the aquarium walls. Please help if anyone has gone through this. Thanks

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Comment by Pasterfield on January 4, 2015 at 4:05pm: it sounds like you have have gone to fast. How many fish did you add at once. I had my tank running for about a month before i even added my first fish and then i did not add more then a few every two weeks till i got to the bio load i wanted. How long are you running your light, might be to long and to much for a new dirt tank. the dirt relases alot in the water before it calms down. This could be the algee problem. good luck