IVE HAD A BETTA IN A 2 GALLON TANK FOR ALMOST 18 MONTHS (HE WAS A GIFT FOM MY EX OLE LADY ) ANY WAY I BOUGHT A 30 GALLON TANK WITH SUPPLIES AT A YARD SELL FOR 20 BUCKS I BOUGHT 6 WEEKS AGO EVERYTHING IS SET UP I HAVE 3 LEMON TETRAS 1 ANGEL FISH 1 CORY CAT FISH MY QUESTION IS CAN I PUT THE TETRA IN WITH THEM OR JUST LET HIM BE