After 30+ years I've done about everything from one to many, large tanks to small.... Right now I have a 90 and 75 going and setting up my 2nd 75 tomorrow. After selling my 350 gallon, I've come to the conclusion that I prefer the 6' or less tanks for ease of moving and prefer glass over acrylic. Done the single dovii and community cichlids in the 350 and still prefer community.
I prefer to have the single cichlid in a tank and then build around that with tetra/barbs, catfish/loachs. The chocolate is my favorite cichlid and I'm centering a 75 around that because its what makes me happy. The bichirs I just got and will get a 6' for them when the grow because they are my wives and for the first time in over 20 years of marriage she has actually taken interest in a fish in my tanks...she even named them all. The electric blue acara I just got a few weeks ago, and I'm in love with them and will decide who to put them with.
Bottom line is to do what makes you and the fish happy and not try to please others. I think I strayed from that and finally got on the track that I want and this hobby is giving me what I want and in the meantime my fish are happy also.
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