So right now I have 2 oscars in a 20 gallon tank that are both about 2 inches. I'm looking for a tank to house them in after they get to large for my 55 thats holding a sev and a bichir. I found a 75 gallon for $150 Will this be ok for a few years. or should i go bigger like a 100 gallon or 125. Should i wait for a deal or take the 75 cuz its a steal with a stand and marineland canister filter