I used to breed excessively and all my caves were on the bottom those that weren't had an entrance platform. Like slate or the top of a flat rock. Flow not so important oxygenated water the most important.
Thanks Lealea. Good to see you back on here.
I've noticed some of the fish venturing up to the second and third tier.
The fish all seem a bit happier since I've covered the front of the tanks with cardboard
One thing I have just realised about the flow though is that my L200 stopped eating and looked very skinny with no wavemaker but started eating like pigs when I put it back in