Hate to say it but this is a really overstocked tank and the foot print is not really ideal for all those dwarf cichlids. You also have quite a few schooling fish in single or low numbers.... Since the tank has been going for so short while now I am guessing that some mistakes have left the schools low and just not been replaced. I would never advise pinning your tank on it as it is not a good way of working it but it is a good loose guide, I am on about the inch per gallon rule and running through your list quickly your up at about 80 inches in a 37 gallon tank - not taking into account of what the Algae Eaters are as if they are plecs that really takes it over....So I would really look at taking some stuff out and replacing things that are issues in that size tank. But before we start the Discus is a no, tank is not big enough for them and they need special conditions - ie, high temperatures, low ph and very very low nitrate - which you can not always garunte from tap water. So off your list I would do 4 Red Line Dwarf Cichlid - 1 male, 3 females (Apistos are found in huge groups in the wild and are not really a pairing fish, they are a hareem spawner so you will see much more natural behaviour and taking out the other males in a tank this size are going to increase the lifespan of the group. 2 Pearl Lace Gouramis - though you could go for 1 male 2 females which would work for the top layer of the tank3 Swordtail - any mix of colours do 1 male to 3 females and you should get some spawning though the other fish could predatate on them but it will just keep the numbers down and stop you getting overstocked too quickly. 8 Neon Blue Rainbowfish 10 Neon Tetras or 15 Galaxy Rasbora5 Blue Line Goby - Nice fish, recent addition to the hobby in any great numbers, from what I have heard they do well in groups so would be a good idea. I know you say the tank is peaceful but with that many cichlids and that many gourami in the tank it is kind of in a balanced situation where things could just plainly kick off. You also have fish in there that I dont think are suited to such a small foot print front to back. Also the schooling fish that you dont have a full school need to go I am afraid. The ones I would rehome sooner than later would be Kribensis - if this one turns violent the Apistos are going to be in troubleYoyo Loach - Shoaling fish, also at adult size of 5 inches a group would be too bigGolden Gourami - on the list above I put pearls but any of your gourami would work in a small group of their own species though pearls are the most peaceful and predictable. Congo Tetra - same as yoyo loach, get big and need a shoalAngelfish - needs a taller tank as it grows will end up with deformed dorsal, anal and ventral fins3 Algae Eaters - what species are these? Though few fish called algae eaters are good fish for this tankFemale Betta - similar story to the Gourami, all antaboids are aggressive to each other and it could cause issesRoyal Gourami - same as other gourami commentsNot knowing the ages of these fish as it is a factor with these types of fish as when they come of sexual maturity whether in a breeding situation or not its going to be the issue...Hope that helps, I know its never fun to have comments like this on a forum but its just trying to help, like I say with so many gourami and cichlids I think big problems will result eventually also some fish are too big and the bio waste of the fish are an issue as things like your gourami and kribs are quite a sizeable fish so are going to impact on your bioload when you are so over stocked.Wills
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