Those Roselines are going to need a larger tank at Least 4 ft I keep mine in a 72g and I plan on upgrading to 125g+ 6ft tank in the next year or so as they grow. I would recommend a school of a smaller fish like cardinal tetra,rummy nose tetra or harlequin rasboras. These fish seem to school the tightest you could easily keep 20 of them in your tank. The angels are going to outgrow the tank as well.
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