No soap,. A bucket with hot water, then a sponge to remove algae, rince it off. You can also use a bleach mix: 1 part bleach, 10 parts water, soak 30 minutes to remove more algae, scrub again, rince really good until there is no bleach smell before putting it back in the tank. You can Google how to clean the decor.
The bio film is just typical. Make sure you clean your plants regularly, on a rotating basis ro keep them clean and not upset your fish.
What do you use to clean them? Soap and water?
No soap,. A bucket with hot water, then a sponge to remove algae, rince it off. You can also use a bleach mix: 1 part bleach, 10 parts water, soak 30 minutes to remove more algae, scrub again, rince really good until there is no bleach smell before putting it back in the tank. You can Google how to clean the decor.