So I'm new to the hobby and I've started up a new tank 25 gallon tank. After preparing my set-up, waiting until my wood stopped floating, I decided yesterday to finally add some fish to the tank. After visiting the shop several times and watching the fish and doing my research I finally decided what fish I wanted to buy. Dwarf Gouramis and some Cardinal Tetras. The Dwarf Gouramis (only sold in pair) came out pretty damm expensive so I bought other gouramis, thinking these were also Dwarf Gouramis, just to realize today that they are Blue Gouramis which can be quite territorial and aggresive.I bought 2 together with 10 cardinals and one of the gouramis is constanly chasing the other one around in the tank... I'm quite worried now and frustrated cause I possibly wanted to add several other Gouramis which is likely not possible anymore. So do you guys know other fish, preferably not nano fish ( I'm planning to expand the cardinals with another 10) that I can add to the tank and how to prevent one of the blues in harassing the others ?