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In addition to what was mentioned above (all good advice) the loach needs to be in a school as well. Depending what kind it is it could get too big for your tank. I would definitely recommend getting...

I agree that you should up your water changes and upgrade one filter as recommended above.

As for your question, fix your schooling issues and then I think a pair of dwarf cichlids would fit in...

It can't hurt to clean your sponge more often than you already do. Six weeks is a long time to not clean it so doing it every 3-4 weeks would be better. If you notice it ever getting dirty or...

But people obviously do this, so is it only safe to do if you have another filter running or is it okay to do if you save the BB on from the biomax that is also in AC filters?

I don't want to change the topic here but if you clean the sponge under hard-flowing water right from your tap would it kill some of the BB on your sponge? Should you only do this when you have...

I can't think of any that don't need to be in schools. You could go for 7 or 8 loaches instead if you wanted but other than that I can't think of anything. Maybe someone else could help.

+1 to all the above

As for the stockings issues...

2 gouramis in a tank that size seems dangerous. I think one will most likely kill the other and you should try to rehome 1 of them.

Tetras...

I'm sorry I misunderstood what you were saying before then. You are right in what you are saying but I thought of it a different way and didn't quite understand what you meant by it.

I don't want to disagree with you KevinVA but they do in fact lip lock when breeding. This article explains breeding behavior in detail and I found this exact quote from it. It could be a territorial...

You could always try to trade them to your lfs for store credit. Not all of them do that but some do.

Have an aqua clear 50 filter and I do weekly water changes of usually 30-50% depending on nitrate levels. I usually just do 50% to be safe.

So you think it can be done? It seems ok to me but I...

Your nitrates are fine. Anything below 40ppm is safe and below 20 is ideal. The lower the better for the most part.

You may need some ferts for a low light setup if you do not have them in your...

I'm looking at adding a school of harlequin rasboras to my 20 gallon high tank. Right now it is stocked with 2 Bolivian Rams and 8 cherry barbs. I'd like some more fish in the top third of the tank...

What are your water parameters? specifically nitrates? How high do the nitrates get before you do your water change?

Adding another filter should be the way to go. I've owned aquaclear and aqueon quietflow and the aquaclear filters are by far superior. An aquaclear 30 should provide enough filtration for you if you...

I think there are better options than just restocking. I'm sure the diffuser wouldn't be hard. Also, your filter(s) in total should add up to being rated for twice the number of gallons that your...

+1 andreahp

Cycle your tank first then add fish slowly if your doing a fish in cycle. I would recommend a fishless cycle though or transferring over filter media from your old established tank.
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Sounds like it could be. Hard to tell exactly without more detail of their interactions. Check out this article that explains their mating behavior pretty well.
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Male and females lip lock often. It is part of breeding but doesn't guarantee that they will. It's just part of their normal interaction with each other.

Once you start to get algae growing in your tank you know its been long enough. If your water is good enough to prevent algae then just wait a few months after your tank is completely cycled. I would...

I do not think it matters that your gouramis are 1 male and 1 female or 1 male and 3 female for the dwarf. The fact that they look similar will result in one chasing the rest until they die, most...

I will third on on your own revelation. Your gut gave you the right feeling there.

How many corys do you think I need in order for them to swim around more?

Ok, I thought increasing the school might make it better but wasn't sure and didn't want to buy more for them to just sit back in the corner and rarely see them. When they eat do they do it right...

Java Fern and Java Moss are the 2 most common easy growers to put on driftwood.