Yeah, I probably wouldn’t add much more to there as those clown loaches are going to grow, and they can get rather large. Same with the pleco (if you have a common pleco expect 12-14″ easy, if you have bristlenose expect about 6-7″ ish, and so on) and the ghost knife. In addition to that, ghost knifes can be quite shy and nervous in nature and are sometimes best left to a species tank. If I were in your shoes, I would really contemplate a larger tank before adding anything else.
When contemplating adding cichlids, you really want to think about your water chemistry before deciding. Most cichlids can adapt to different water chemistry, but they won’t show as nice of colors (which really is the reason for investing time and money into cichlids!). Looking at your fish, your most likely compromising for the black molly, as they tend to prefer slightly brackish and slightly basic water. Everything else will prefer softer and more acidic water. This is really going to give you your optimal range for cichlid choices just by narrowing it down. See, South American cichlids and African RIVER (important word) cichlids, will both prefer water leaning towards that nature. African cichlids prefer a much higher pH with harder water (8.0 to 8.3 for Malawi/Victoria specimens and even up to 9ish for Tanganykan cichlids). Aside from that, you should look at smaller growing fish with a more passive nature to stick with fish that won’t eat or attack your smaller fish.
On those notes, stick with rams, apistogrammas, and kribensis if you must insist on adding any other fish to your tank (although, like I already said, I really wouldn’t add anything else and would be contemplating a larger tank instead of more fish). They’re rather small as per cichlids are concerned, and you’ll generally only see rams and apistos show aggression between two males (often just displays). The only other aggression you might see would be the opportunistic nature of any of these three types of fish to pick off molly fry (hey, it’s a high protein snack!). Otherwise, your neons and danios would make excellent dither fish for both the rams and apistos, as they can sometimes be more skittish.
I would have to recommend, in addition to the rift lake cichlids, you steer clear of discus and angels. Were your tank not so heavily stocked already, I could possibly recommend one or two, but not with how large your fish are going to get. Angels also have a nasty tendancy to eat smaller fish and tetras (like the neons so often suggested as companions and otos)
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