Heyo Guys, Thanks for the help on my previous threads! Right now I have a 15 gallon tank with one threestripe cory and around 7 adult BN plecos and 10 newborn BN plecos. In november I will get a 32 gallon tank in order to give them more space and add 4-5 threestripe corys to make my only cory who has been quite lethargic for a few years finally happy again. There is a few things that worry me though: 1. My lonely cory seems to spend most of his time in the small shade of my pump. There is a huge log in the center of the aquarium but I assume that he doesn't like to go there as it's the plecos' home and I assume they are quite territorial with it. Sometimes a young BN pleco will gently push my cory out of the shade though to take his spot. So my two questions for my next aquarium which will replace the current one are should I get some lights that are less strong and should I give some of the BN plecos away? I don't want them to breed any further and to be frank although it is completely natural, it annoys me that my cory is constantly being shoved in the corner of the aquarium. 2. What kind of substrate should I get for my new aquarium? Sand? small pebbles (current substrate)? or something else? 3. There is a ton of duckweed constantly growing on the surface of the water, should I get rid of it? TIA for the help!