I am in the process of designing a tank. I think the dimensions will be 3'wX8'LX2'Tall. Does anyone know how to calculate how many gallons would that be. Or should I go 2 and 1/2' tall? It will hopefully be for 2 oscars, 1 or 2 Jack Dempsy's, some severum (not sure how many I should do), a knife and a few rays. What do you guys think, will this be big enough? I hope so because really I could only add length and still be able to get it in the house, lol. Then the length also determines where it will have to be set up, and which way it will enter the house. How much of what filtration do ya'll suggest? I really wanted a super deep tank, but it just wont fit if I am to also get the kind of lateral space that rays like to have. Any suggestions or ideas you have will be awesome. Also would like to hear good substrate ideas, I will probably not put any decor in the tank so the rays have as much free room as possible, what do you think? thank you in advance:hearts::hearts::hearts:You all rock, i am so happy to be on ac!!!!