I have gotten rid on my parrot fish and totally changed out my tanks....so now i have a 20 gallon that is currently housing 2 small silver dollars and 2 powder blue gouramis. I am going to up grade my tank to you 55 or 70 as soon as I can save up the coin. My question is can I put in a pair on angels or will they not get along with the other fish? I really would like to get them now and when I upgrade just leave them in the 20. Any input??