I am afraid I do not have anything posted recently that I can recall off the top of my head. I am kind of a mad scientist when I whip up food and use what I have available. That used to be a great site that had detailed instructions along with exact breakdowns for fat, calories, protein, etc but it disappeared two years ago. Not sure what happened.
Very basically, you need a protein source and veggies plus something to hold it together (gelatin or agar agar). Extras added are a big plus.
Good protein sources are salmon, mackerel, any basic white fish (flounder, tilapia, cod, etc). Some recipes use bloodworms or earthworms as a protein source. Combos of proteins can be used too. Egg yolk is another good one. Some seafood is fine such as shrimp, clams or crab but in limited amounts. Same goes for tuna due to possible heavy metal content.
Veggies such as spinach, kale, turnip greens, peas, broccoli, carrots and sweet peppers (etcetc) are all great. Carrots and red peppers are natural color enhancers. Some fruits can be added as well but not in excess. Some people use puréed baby food veggies (meant for human babies).
Extras are garlic, paprika, spirulina, multi vitamins, probiotics, vitamin C, fish oil, etc. Everything I use is human grade foods and vitamins that are thrown in food processor until 100% puréed. Gelatin (always use extra) is then dissolved and mixed into the purée. The food will set to firm overnight in the fridge and can be cut into cubes for feeding. I freeze most of it in flat sheets for future use.
Ok, not exactly 'directions' per say! Do some research first to get a general feel for how different people make gelfoods and what they use. Utube has quite a collection of videos. Kokos goldfish likely has a collection of gelfood recipes as well but it sometimes helps to see people actually making the food.
A super simple quick recipe for me would be something like this:
1 small can salmon in water (add liquid too)**
1/2 cup peas (defrosted)
1/2 cup spinach (defrosted)
Tsp chopped garlic
2 egg yolks
2 multi vitamin (crushed)
5 probiotic capsules
1-2 vitamin c
1-2 tbsp spirulina/powdered bloodworms/brine shrimp/nori
Purée. If too thick to purée, add tiny amounts of tank or distilled water. If very soupy or watery, add additional spirulina (or other powder). It should well mixed and thick milkshake consistency. Dissolve 1-2 packs plain gelatin in a small amount of water and purée this in. Place in flat pan of some sort to set. Makes around 1-2cups liquid food. **add more protein for fry/youngsters, more veggies for mature adults
This is not exact but an approximation as I usually make larger batches using big cans whole salmon/other proteins, bags of veggies and whatever else I can find in the kitchen. But hopefully it will give you a general idea to experiment from! And I am likely forgetting things! Feel free to ask any questions and do not be intimidated-it's much easier than it sounds!