bs6749
Aquarium Advice Addict
If you get GBR's you will need to buy them in multiples of 2 and you should buy them in sexed pairs, meaning one male and one female. A 10g tank is large enough to support one multiple of 2 but since you have fish in there already you won't be able to safely keep them in the same tank. Corys are ideal tankmates for rams but not together in the same 10g tank as it's too small. A 10g is fine for a pair of GBR's and that's what I used for my breeding setups.
I fed mine NLS Cichlid Formula (1mm sinking pellets) and they were the right size. I have a feeling your convicts are getting large pellets which would be okay for the rams if they can fit them in their mouths. You may have to break apart the food if it is too large for them.
Do not use water that has been "softened" by salts in any aquarium. You will need to use tap water and/or purified water in ratios and also dechlorinator if you have city water.
That substrate isn't really ideal for corys but it is okay. Ideally, you would have sand since corys have barbels and would like to sift for the sand for food. You don't need driftwood in the tank for corys nor for GBR's but I'm sure it would be appreciated by them and you if you had some in the tank. Live plants or fake, it makes little difference to them. Live plants can be beneficial for removing nitrates from the water and they also have the benefit of not damaging the fish if they rub into them. Some of the plastic plants can be damagind to fish as they are sometimes "sharp".
Are you not liking my advice or are you simply ignoring it? I'm not going to tell you that you can keep a pair of GBR's in a 10g tank with cories because it is too small to work.
Also, Mike is very new to fishkeeping in general. I don't know if he's ever kept a ram in one of his tanks so he may have no experience with them.
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