I have a 10 gallon planted which is also my favorite tank. It is heavily planted about 8 stem plants and there is also a few crypt bundles in there. I also have two Dalmatian Mollies which have been breeding on and off for about a year now. It is also stocked with 1 Mickey mouse platy and 3 Stein Cory cats and 1 orange guppy. I use no C02 or Ferts and also keep no pad or filter media in my cheap, Walmart HOB filter, and no bubble stone. all fish are in the 10 gal because they prefer the smaller tank and get insecure And a lot less active in the 20 or 45 gal tank which is stocked with Dalmatian Mollie fry and adults. I considered my 10 gallon to be a little slice of heaven for my fish and a shining example of good fish keeping until an experienced member informed me it is WAY overstocked and said my fish are probably stressed, tho they seem the happiest of all the fish in all my tanks. Any advice?