loachlover77: As you may know, clown loaches spurt growth to 4"-5" and THEN they grow very slowly.
You came to this forum requesting help if I remember correctly? You had some sick clown loaches with ich and fungus (your version of fine in a 55g?). After you treated for those the loach started hanging out at the surface, not really a common behavior for clown loaches and you quickly deduced that something was wrong. So, you came here and made a thread
http://forums.loaches.com/viewtopic.php?f=7&t=23011
Based on that thread we learned that:
1. You have 3 clown loaches in a 55g tank ranging from 4"-7"
2. You are in-experienced enough to state that you have 0 Nitrates in a non-planted aquarium (in an over-stocked tank no-less)
3. You have 2 HOB filters running this tank, neither of which puts off the current that clown loaches so enjoy
4. You keep your tank at 86 degrees
5. You only do water changes once every 2 weeks and even then, you only do 25%
6. You have 3 clown loaches... and only 3....
So, lets compare that information with the Clown Loach guide (
http://www.loaches.com/species-index/cl ... cracanthus ) the powers-that-be of this forum put together, here are some quotes:
"Care: This is a wonderful loach, but too large for most hobbyist aquariums.
(1) Allowed a minimum of 75 gallons or more, young Clown Loaches thrive in groups.
(3) They require large turnover, efficient filtration systems and current supplied by additional power-heads, (5) frequent water-changes and great attention to cleanliness in the aquarium.
(4) Temperature: 78ºF to 83ºF (25-30)°C
They must be kept in groups.
(6) The absolute minimum recommendation is 5, but basically the more the merrier."
So,
1. You keep your clowns in a 55g tank, the MINIMUM suggested is 75
2. Diana explained why you don't have 0 Nitrates on your help thread, so I won't drag you over it again
3. You are using HOBs, which provide 0 current
4. Your tank temp is 86, highest suggested is 83
5. You do 1 25% WC every 2 weeks, suggested maintenance is weekly WC's
6. You have 3 clown loaches, the MINIMUM suggested group is 5
And that's just the basic care stuff.... all that coupled with your golden-globe worthy quote "you can grow a clown loach out to 1/2 the length of it's tank size before you upgrade the tank". I conclude you are a beginner or you are just plain ignorant and irresponsible with your fish. Either way, it is not a good situation for your clowns.
No one is suggesting that "clowns grow quickly in a 55g tank". Sorry but, you need to get past the size thing here. It is not JUST size - it is also the fish's behavior. They are bottom dwellers, they come from rivers = long foot print tanks with a current. It is also immune systems/make-up of the species you keep = they are sensitive to water conditions (which is why you had ich and fungus). I could keep going on this, but I am hoping you get the idea?
Oh, and - you probably do have an oxygen deficiency in your aquarium. High temp., no current + minimal surface agitation = lack of oxygen. Add an air stone or sponge filter, if you can.
On a side note, I am sorry if that came across as harsh - I really am just trying to help you and your clowns. Everyone makes mistakes in fish keeping - totally normal. Learning from those mistakes and gaining more knowledge is the difference between a beginner and a seasoned fish keeper.