Your tank set ups are really really good.
the 55 seems to be decorated in a way that not only provides good cover and territories for the fish but the colours of the fish really stand out against the substrate and background. thats a fat healthy little oscar you have there, and I'm impressed that you tried Tiger Barbs cause i've heard of them working with Africans but I've never heard of them with american cichlids.
The other two tanks have lots of movement and seem to be set out well for the fish you have in them. Also that HRP is really really stunning. such bright blue colour really contrasts to the green plants and wood. You should be proud of your set ups they all look great.