I can't move the plants because they have taken root in the stone. Concerning the params, the nitrite level is somewhat high (about 0.8), the amonia level is quite low (0.1). The new fish eat a bit only if some flakes manage to go down. For the nitrite level, I've tried changing 20% of the water and putting in some Cycle, but it doesn't seem to be doing the trick. Any suggestions?