Fishylisa, sounds like your doing fine. Most of us in the hobby that really care for our fish try to do the best for them. The problem is that life is not ideal. All of us have different situations (money, space, time, etc.) that dictate our setups and how we take care of our charges. You will find tons of great information on this forum from a lot of really intelligent people. The problem is the medium (the net) we are using. It's so easy to give ideal, objective, detached advice that may be correct, but it's not a perfect world. We are all on this forum for a reason....information. I doubt if the best among us has the perfect setup for any fish he/she has...there is always something that could be better. That's the hobby. Anyway, enough pontification.
pbecot01, I can't give you an inches per year estimation on Clown Loach growth. All fish will grow faster if fed more and less if fed less. Some fish will reach their adult size in less than a year (Oscars for example) no matter how much you feed them, and others will take a couple of years. Also, it depends on the individual fish and their temperment. I have two Clowns, and one is very aggresive during feeding time, and the other is not. Hence, the aggressive on is twice the size of the other. I can only tell you what I have observed. I bought my "medium" clowns at 2 inches 4 months ago. One is a fat 4 inches and the other is a thin 3 inches. At their current rate, I don't see them getting to 6 inches for at least another year. I feed 2-3 light feedings a day. You may check Loaches.com for more info. I haven't read all the way through the site, but it seems like a good site.