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Originally Posted by Rollin007
I'm looking to start up a saltwater tank. I have 2 big tanks that I used a while ago for some freshwater fish. I have a 90 gallon high and a 120 (I believe) long, give or take a few or more gallons. It's been a long time since I even messed with it.
Can someone please give me their expert advice on me making my "90 gallon high" tank into a saltwater tank? The tank is about 3 feet tall, maybe a little taller, but not much, the width is a little less than 2.5' and the depth is about a foot and a half... Sorry, I don't have the exact measurements, I not at home at the moment... I can get the measurements, if someone tells me that it could be used for a good tank for saltwater... I still have that 120 gallon long, but that thing is huge and I was thinking about just saving that tank for sharks or something. So any input would be nice. 
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There are a couple of thoughts about saltwater tanks: The more water volume, the better... and, Since fish don't usually swim up and down per say, the longer the tank the better.
In my experience, either can be made into a saltwater tank with this caviat: you should be very selective as to which fish you put into the 90. Fish that need a lot of swimming space or grow rather large will probably not do very well in a short ( length wise) but tall tank. There are a lot of fish you can use in there but there are a lot that shouldn't go in there as well so research, research, research before adding fish.
As for the 120 for sharks, again, you need to be selective as to which sharks to put in there. Cat shark types ( that walk along the bottom of the tank) will do much better in a rectangular shaped tank than any active swimmers like leopard sharks, dogfish, hound shark types. These types really do much better in rounded type tanks as they do have a history of being injured in the corners of tanks.
Hope this helps
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