09-08-2012, 07:40 PM
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I have to agree that you are overstocked, but as it seems your tank has been running well for 6 months, and everything is going smoothly, I have to assume that you've been doing a good job with keeping things clean and parameters stable for the fish that live here!
My guess is that your Chinese Algae Eater was stunted in growth from being kept in such a small tank. Sad as it is, I agree that you owe it to him to keep him, and as long as he doesn't get too big or too aggressive with his tank-mates, you can work it out in a 37 gallon tank, I think.
One thing to consider is usually fish sold at the shops are juveniles - meaning that they haven't reached their full size yet. It's possible that things don't *seem* crowded in there at this time, but this could change in the future. If it were my tank, I would choose one group of fish - possibly two - to re-home so that the others can thrive. Either that, or start planning an upgrade to a larger tank! Another option would be to get another smaller tank (though larger than your tiny one) to put one of the species into. I *believe* that you could get away with putting the gourami into a 10g tank, and maybe the glass cats, though 10 of them would probably be too many for a tank that small. More research is needed here, but there are options for you!
One question that pops into my mind is what type of water do you have in your tank/tap? Some of these fish are happier in softer water, while a few of the other types prefer hard. Again, were it me, I would check the Gh of my tap water and keep those fish that would be happiest in the water I have. :)
But if you haven't had any issues arise, and your parameters are stable, tank is clean, and nitrates not out of control, you must be doing something right! I hope this helps somewhat - good luck on your tank!