I have had to remove lots of dead or rotting vallis leaves, some are OK though. The above amazon sword has rotted from the crown up. It smells like halitosis. What did I do wrong. I have had them just over a week. They were planted in gravel. The tank is a Juwel 96L and has been running 2 weeks. Less than a week ago I added 4 zebra danios to start the tank cycling. Today I had to install a new filter (but I used the old sponge) because the first filter was running awfully noisy despite being taken apart and cleaned twice. The new filter causes less water displacement, I did wonder if the old one was too vigorous, as I had the spray bar on.