I have recently begun the processing of upgrading my small 10 gallon tank to a 20 gallon tall tank. I decided I wanted to try out a planted tank with the new setup. I am a beginner so I am still figuring some things out. My 10 gallon tank only had low light plants such as anubias and marimo moss...

Today I picked up a brand new, apparently unused twenty gallon high aquarium, with a Whisper 10 - 15 gallon capacity HOB filter, for ten dollars at a flea market. The tank passed the leak test, and the filter runs fine too - which also doesn't even look like it was ever used. I found the...