Anubias melting

Lab_Rat

Merry Christmas!
Dec 3, 2009
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Deep South
Just the past couple of days I've lost 2 previously quite healthy anubias nana plants in my 2.5g betta tank. Plants looked good, then had a couple yellowing leaves, and when I went to prune them the rhizome just disintegrated. One plant was strapped to the driftwood, the other was above the base of the tank (no substrate in the tank, have a subwassertang lawn). I've kept anubias for many years and have never hit this. Only weird thing I've noticed is some kind of whitish growth on the driftwood (maybe some kind of fungus?) Any ideas on what the problem could be and a remedy? I'd hate to lose any more of them.

Tank specs:
Planted 2.5 g tank with driftwood, anubias, java fern, and subwassertang lawn. Lit by a spiral CFl desk lamp, heated, azoo palm filter, 50% wc weekly. Has too many ramshorn snails and a betta.
 
I had the same thing happen to a couple anubias plants a while ago. Never seen it before or since. Also never figured it out. How big were they?
 
One was small, with about a 1.5" rhizome, leaves spanned about a 3" diameter. The other was larger, with about a 3" rhizome, and leaves spanned wider. Probably about 15 leaves on the small plant, and 20 on the larger one. They were nice plants. :cry:
 
I had some kind of rhizome rot in 1 or 2 anubias. Same thing mushy rhizome, cut back to healthy firm growth. There was a thin brown middle inside so I cut back more next time but it kept happening. Ended up pitching it, no other anubias "caught" whatever it was.
 
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