I had good luck with tin foils as dithers for a lot of years. Pitcus cats are always in motion... docile... and fast enough to get away from just about anything.
Agreed. Tinfoils & SD's are too big to really be dithers in a 55, danios are the way to go. I never thought of firemouths but I'd think the jag would end up killing them...along those lines how about cons?
I do not recommend Giant Danios! My Oscar ate 2 of them when he was less than 5 inches long! Both Danios were around 2 inches if not 2.5 inches! Sooo... They do not get my recommendation.