We started the tank a little over a month ago.
I also wanted to ask you what other fish you recommend for our 20 gallon tank. We have 3 posibbly 4 with the baby mickey mouse platy's, an albino corycat and 7 neon tetras. Do corycats do better when there is more than one and also what other fish would be good for more activity.
OK for now you should do water tests every couple of days, if you see any ammonia or nitrite then do a water change. when the tank's been running for about 2 months you can drop down to testing weekly, after 6 months drop down to testing every month or so.
yes cories need to be in a group, get the little fella some friends. a group of 6+ is best.
you can have 20" of fish, after adding cories you'll have this
4 platys - 8"
6 albino cories - 12"
7 neons - 7"
so that's 27" of fish, so the tank will be full at that point, it will be a fairly heavy stocking but manageable.