Normally in nature this can be interpreted as a sign of stress. It is a kind of survival mechanism of plants. At least, if you have not taken off the tops....
I have read that before Lu, there is also another school of thought regarding aquatic plants also. There is the thought that flowering in certain plants is an in grown mechanism, a bit like the common flowering plants like aponogetons. Some suggest that's the reason they benefit from a rest. I'm not sure whether this has anything to do with bulb plants.
Yeah was gonna say mate 14 litres is too small for cpd's, badis badis badis! I'm getting rid of mine dunno if you read Eden but cause of the high flow I never see them or him dunno if there's 2 or 1 now I see them that rarely.
I know what you mean with the fern minnnt, mines looking ropey lol and every time I see this scape it makes me wanna persevere till its this green. Ian ya show off lol.