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if it's well cycled and has lots of water changes I don't think ammonia should be a real problem. Plus you have all those plants. The API test often falsely reads 0.25 anyway. pH swings are quite a big stress factor for a lot of fish :(

8.2 is ok for goldfish don’t worry about changing it :)

IMO i would ditch the corys because they like a decent sized footprint and a group larger than four. The endlers will work though, i'd go with four plus a pair of sparkling gourami if you're interested in those.

As said here, as long as you get a >2 inch scalare angel it should be fine in your tank. Other than that I'd just add a few more corys, say up to 20 of the same species. Avoid panda or peppered cory because they prefer cooler water than angels. no you definitely can't fit pretty much any fish...

a group of cherry shrimp, plus some amanos and a nerite if you want would be great :) definitely wait until the tank has matured and developed some microrganisms. 1-2 months is often sufficient, if there's still not much visible growth of algae/biofilm, you might want to feed shrimp and snails...

i would just add a couple more honey gouramis, but with twelve tetras you might notice it's quite crowded already. If it's not a 20 long I'd work on moving up to a 29g+ or another 20g.

probably fine, since they've most likely been bred for several generations in warmer water in that case. :)

hi, a couple things going on. Firstly if you can get the angelfish into something more than 50 gallons (with at least about 20" of height) that would be much better. A fully grown angel should grow up to 12" , so it will definitely need more vertical space. Along with that I'd put one of the...

I second chili rasboras or ember tetras, whichever you can find first! 20 gallons is my minimum for dwarf gouramis and tetras of that size.

Hi, female platys are almost always pregnant, especially within 4 months of exposure to mature males. So yes she's most likely pregnant, congrats :) I'm surprised she hasn't given birth at least once yet, it usually doesn't take much longer than a month for fry to appear. Maybe they all got...

about the 55g, just go with 3-4, five is a bit too many imo.

Other than what you have, I would just recommend some blanched/microwaved veggies cut into bite sizes, especially peas. You could buy more pellets/flakes but it's not necessary. Feed veggies more than the live/frozen foods! :)

most plants with red/purple colours unfortunately require high light. For example you could try rotala rotundfolia, which grows okay under medium lighting and with basic fertiliser. It will have red growth under the right amount of light. :)

hi, I would avoid any more fish your tank seems pretty full. I guess you could add a couple more harlequin rasboras, say up to ten. Kuhlis do better in larger groups and longer tanks rather than higher ones. :)

if you can you can add some warm dechlorinated water now and then until the new heater is in, that could help. You could do 10-20% water changes every few hours and use some ~82F water to refill.

get a group of about six or seven, and feed them meaty sinking foods like hikari sinking wafers, or whatever similar product is available. Not algae-based food though. If you can, also feed some live and frozen foods like brine shrimp, daphnia, ostracods etc.

otos like to be in large groups so I would pick something else, like cherry or amano shrimp if you're looking for an algae eater, or pygmy corys if you just want any old bottom dweller. If it's a well matured tank (around 6 months or older) with plenty of visible algae, then you could maybe...

It could possibly be ammonia, but often the tests falsely read 0.25. Still go ahead with the water changes and ensure your oxygenation is good. Higher temperatures make oxygenation worse so keep that in mind. Quite possible the two dwarf gouramis are very stressed from being together too...

Ostracods are the easiest but brine shrimp and daphnia are also good. Microworms and vinegar eels are also pretty good. I would pick out at least two, plus a high quality betta/insectivore pellet and the occasional algae based food.

Nope, but since you're in the UK and the weather will be getting colder I'd keep them indoors. Colonies start to dwindle under 15 degrees in my experience.