I recently made some changes to my tank. Took out most of the plants as they were not surviving more than 2 months. This is my tank. I took reference from http://www.urbanaquaria.com/2013/01/13-litre-nano-tank.html wanting just something really simple. But after changing to this, I realized my tank's glass has brown spots on it quicker than before. I used to do cleaning on my tank's glass once every two weeks, but now I have to do it once every week. Also, my filters are getting brown a lot quicker too. Are the brown stuffs diatom algae? Or are they caused by the soil? The soil has been around for maybe 5 months+. I have 3 neon tetra, 4 gold tetra and 3 rummy noses. All of my fishes are doing very well currently (they used to not be swimming much and a few of the tetras died.). I took the initiative to separate some of my fishes that I thought were ill and after a week they seemed fine and I placed them back and now they're normal again. My Shrimps aren't doing so well. My 3/5 of my CRS died in 2 weeks. My Cherries are doing much better. 3 of them have survived more than 2 months (which I'm really happy after many trial and errors) Thank you for your advises in advance. I hope to receive some help on my tank's algae, and if it's algae, how can I prevent them from getting worse.