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Aslong as you keep the nitrates and nitrites down all will be fine, the biodigest will really help, and i mean alot.

I did another roughly 30% water change. The nitrite and nitrate levels are better now.

The opae ula seem more active and visible since the heater was introduced, which is good, though it only seems to heat the aquarium up by 2-3 degrees. I am also now getting heavy condensation on the cover glass, so might link the heater to the timer I use for the lights to stop too much of the water evaporating while I am away from the tank.

The slime algae has also formed a thick green film on the surface of the water. Should I remove this?

Do you have a photo? if you don't have much algae in your tank i would leave it. However if it is annoying you i don't see any harm getting rid of it.

Pictures not showing up on my end.

Same for me

Sorry about that, here are the pics:

Nice! How many do you have in there?

That looks like one very healthy Opae ula tank! well done mate If the green algae gets too much you can remove some or just buy a nertite snail and it will go about removing all of that and shouldn't reproduce.

I added 20 and at least 1 died, so I would guess at probably 17-19.