I started building a massive lake in skyblock (too big to be honest as it is taking ages!).
The frame is cobblestone and at the beginning I saw my island level go up.
Now I have reached about 95 I can place a few hundred blocks and the level doesn't seem to increase.
However, if I plant a few trees the level does go up.
Is there a limit to how many of a certain type of block affect your level?