Sorry, this is posted in the wrong area for responses. Pls. re-post to the 'Discussions' area next door as it were (see top of this page). These plants don't mind being rootbound, next time, I'd leave it alone until roots start coming out of the bottom of the pot. Repotting during bloom can kill the blooms -- that MAY be what happened here, repotting while in bloom likely killed the blooms. What kind of sand did you use & why (pls)? Sand is NEVER, EVER a good idea. It's likely to block the air spaces in the mix & cause drainage problems in future, pls. don't do that again if you wish to keep your plants healthy.

Can you post an image? Beyond that, could be rootbound. If so, very likely cultural/ environmental problem rather than disease.

Whenever you remove part of the roots (including damaging during repotting even if you don't root prune) the plant is put out of equilibrium. The amount of leaves to roots is a delicate balance and so when you take the roots, the leaves sacrifice themselves (the oldest) to put extra energy into recovering lost root mass which will actually increase overall vigor and health of the plant. The same goes if you prune a plant back way far. The b plant uses root material as a sacrifice to put out a flush of new growth so photosynthesis can again commence.

Anthuriums are epiphytic (meaning they grow up in the canopies of the rainforests on the sides of trees), just like orchids, and they grow in the same habitats as orchids as well. Tho they can adapt to growing in a fast draining soil mixture that's blended with orchid bark, perlite, and charcoal. They are closely related to Peace lilies. Peace lilies also prefer a fast draining soil mixture that doesn't stay soggy either. So as long as the roots can breathe and have access to plenty of oxygen, you'll never have to worry about "overwatering" them. Both of these plants live in the rainforests, where they can get rained on on an almost daily basis. So they're no strangers to water. It's a common misconception that overwatering a plant is about giving them too much water, when it's not. It's when the soil mix holds on to too much water, cutting off the supply of fresh air to your plants' roots, causing them to suffocate. For my plants, I don't ever let them dry out. But I also use a proper soil mix that doesn't hold on to too much water either, no matter how much I water them. With it being wintertime, I don't water them as often as I do throughout the rest of the year. I have a similar sized plastic bucket that I sit my plants in and fill it up to the soil line with water, and I let them soak for about half an hour. Then I'll remove the pots and let the excess water drain away. You notice how the runoff will have a slightly brownish tinge to it from all of the dissolved solids in it. That's when I'll flush the pot out with some fresh water, until it starts to run out clear from the bottom. This helps to get rid of any excess mineral deposits and fertilizers that would otherwise buildup in the soil over time. These plants come from the rainforest, and they absolutely love water. But they also need for their roots to breathe as well. And I don't worry about spraying them either. They'll do just fine without it. Here's a couple of links to the Exotic Rainforest's website for properly caring for these plants. It offers a wealth of accurate information on these wonderful plants: Caring for Spathiphyllum & Growing the Tropical Anthurium As for the old spathes, you can just let them naturally die back completely on their own. They don't expend energy from doing this. In fact, letting them die back on their own gives them a chance to reabsorb any nutrients and/or chlorophyll from the spathes, which they can reuse in other areas of the plants. This is why they turn yellow beforehand. Once the old spathes have completely turned brown, they'll easily separate from the plant when you go to gently pull on them. This is no different than when the leaves of deciduous trees change color before the trees shed them in Autumn. Because they're reabsorbing all of the nutrients and green chlorophyll to reuse again in the Spring, rather than having to make them from scratch all over again.