AUL are only aggressive to others AUL when young (typically under 8" up to 1.5' ) BUT this is only the case when they perceive there is not enough food around to support their own growth. This aggression is exacerbated when there is not enough space (aquarium foot print) and hiding places. As per
http://www.environment.gov.au/cgi-bin/sprat/public/publicspecies.pl?taxon_id=67620
"
Experiments have shown that they can accurately locate buried prey using electroreception (Watt et al. 1999). Juvenile lungfish in captivity do not behave as they would in the wild. They are aggressive to other small Lungfish when they are living in a confined space, which often has limited food (Kemp 2016, pers. comm.). "
I can concur with this assesment as I am currently growing 3 fresh AULs (got them earlier this month at ~3 inches each) out in a 240g (8x2x2 filtered with a 30g dedicated DIY fluidized sump) and there has been 0 aggression between the 3. The tank layered with about 2" of HTH pool filter sand, a few cuts of PVC for hiding, and a sparse spread of Vallisneria Nana. Unfortunately my Vallisneria aren't doing 100% since I keep my nitrates basically near 0 with the other two at 0 as well. One thing to note is that AULs are nocturnal animals so they are only really active at night/0 light conditions. This makes it fairly difficult to pellet train these fish if you are attempting to grow out several at the same time such as me.
As for
L
LungfishLover1
what is your goal for this tank? Is it a tank dedicated to compliment the AULs with vibrant colors, is a tank dedicated for the biome of one of their native habitats, do you plan it to be bare bottom, planted, etc.
Once I know this information I can properly suggest tankmates.
.
