I have 4 zebras around about at 4cm in a 2ft tank. Im running a under gravel filter, eheim internal filter 2010 (220-500l/h) and eheim air pump 400 (50-400l/h).
I'm not sure if the current/flow of the water in the tank is too excessive for the fish, although i switch the internal filter off at night during feeding time and start it up in the morning again.
Hopefully someone more experienced could guide me in the right direction.
Yes i thought about putting more hiding places, but the reason why i haven't done so is because when its time for feeding i know where they all are and i drop all there feed right about where they hide. Once they get bigger then i will definitely put more hiding places.
I use sand & bb for fry in my tanks, you will find some food will get trapped between the gravel.
Turning off your internal filter is not a good idea, as the bateria in the filter can not live long without the oxygen flow so die & can pollute your water.
Luckly you are still running undergravel so you will still have some bateria alive to cycle your tank.
