But I have 9 zebras (4 adults and 5 youngsters) in a planted 160 liter tank and it would be nice to have something lively in the upper layers.
Does anyone has some positive experience or recommendation for tankmates?
Let me list the former tankmates that were not a succes and why:
Ancistrus: too big and competetive, eats all the zebra food and scares them off

Pearl gourami: idem dito
Hadgets: don't like the strong current
Glowligth tetras: eat all the zebra food

Endler guppies: idem dito
Corydoras: idem dito
Armano shrimps: eat all the zebra food and I caught one eating a precious zebra egg

I was considering last days the fish listed below, but I don't think they are a succes either:
Sparkling gourami: I am worried that the sound it produces could stress the zebra's a little and make it more difficult for them to breed again.
Epiplatys dageti: needs much lower temperatures and very low current
At the moment I have 6 Rasbora hengeli (closely related to the Harlequin Rasbora) that are ideal in the sense that they are small and don't eat anything from the bottom. But I am phasing them out as I am a little fed up with them.
Also I have 4 Otocinclus affinus to help me to combat the algues. They seem to do a good job and they don't compete with the zebra's either.

A tankmate for the zebra imo should:
- not compete for food on the bottom
- be small
- stand strong current and high temperatures
I found it difficult to find such a fish. Does anyone have suggestions?