Is this a bad idea? Mine is looking so bad, I can't even see what's in there. I had a bag of carbon break a few months ago so I know there's carbon pellets in the sand. Also, the sand looks like it has alot of detritus on top of it. I've heard it's a bad idea to vaccuum the sand in a refugium though. The algae looks dirty - can I take it out and shake it in clean water? It's not growing very well anyway. I'm sure it's time to replace the light, so that is the first thing I will do. My mangroves are too tall - they are up in the lights and their leaves are burning.
Any recommendations/ideas?