Do they eat vegetation or proteins? If vegetarian, I'd suggest not going with them as there would be too much competition for food. Farlows are very prone to starving.I have zero space for a 25g+ tank! I'm running four tanks at the moment, and if I get a fifth, it will be an apistogramma borellii grow-out tank out of necessity. My OH hasn't acknowledged that yet, but he will if there are cute baby apistos who need a place to live.
Could they live with the Hypancistrus plecs if a space becomes available? Super chilled out tank, as the Hypans are really timid and lots of oxygenation, because they are rheophilic, Ph 6.5-ish, temp 26.5.
Id instead, look at the sturisoma group, or whiptails