20 gallon long tank stocking troubles

hey yall I currently have a 20 gallon tall tank and wanted to switch over to a 20 gallon long and I’m trying to figure out what to stock in my tank, I currently have 6 leopard danios but I was wanting to maybe add in some CPDs or maybe some type of small raspbora? as well as maybe some ottocinclus catfish and a centerpiece fish like honey gourami, but I’m struggling to work it out in my head, I usually go for very heavily planted tanks and run more filtration than needed for my tanks, can I get some advice? I’ve been trying to calculate stocking levels but a lot of the online calculators are giving me vastly different answers