cleaning planted tank

I have a recently started 7 gallon filtered/heated fresh tank which is moderately planted with leafy plants and has a fair amount of rocks and sand/gravel substrate. 1 female betta and a school of 6 white clouds. I am new to some of the long-term maintenance aspects and have some concerns...

Hi, I have a bunch more questions for you experienced fish keepers. :-) 1) How to clean the substrate of a planted tank without disrupting the plants? What about when plants get really dense? 2) Is there a rule of thumb for how many gallons per hour you need your filter to turn over? 3) Tips...