|
Quite accidentally, I ended up with a good bit of rubble on the bottom of my 20L nano. I have to say it looks ok. Two things to watch out for, however. First, keeping it clean can be a challenge, though a bigger tank might help that. Detritus and some bit of calcium snow are commonly siphoned from the spaces between the rocks. Second thing to watch is that you can't treat the rubble as a typical substrate by setting larger rocks on it. It shifts about quite a bit, particularly during siphoning. My only casualty so far in six months is a shrimp caught on the wrong end of landslide.
I'm using some rubble substrate in my 55. However, I have a pump directed low and the larger rock are seated on the bottom.
Not enough time on either tank in my case to speculate on long term nutrient impact.
|