I think your Albino might be a Platinum 3 Spot Gourami. Temperament varies widely. Pearls are the most peaceful of the Gouramis in that size range.
The Platinum Gouramis are generally considered good community fish when small, but they are not as peaceful as the other gouramis. They have been known to attack smaller fish. When they get older only keep them with fish their own size. Individuals will show varying degrees of aggression. Some will be very belligerent and will handle their tank mates quite roughly. Others will be peaceful to the point of shyness. The aquarist should be prepared to adapt their tank to suit all personality types.
A mix of neutral personalities is an ideal goal for the range of tank mates. You should not include fish which will provoke this species into aggression as they are often passionate fighters. Fin nippers and gouramis should absolutely never be mixed. The trailing pelvic fins and generally slower movement of this gourami make it the perfect victim for nippers. The Platinum Gourami is also a skilled hunter and extremely small fish or fish fry rarely last long.
Good tankmates for this fish are robust cyprinid species like barbs, but avoid those that are notorious fin nippers like Tiger Barbs and Clown Barbs. Other good selections include larger characins, loricariid catfish from South America, and loaches. They can be kept with other medium to large gouramis, but bullying between gouramis is a likely scenario. Bullying between gouramis is a likely scenario as these fish, typical of the family, are fixated on constantly working out the details of the hierarchy.
Temperament: Peaceful - This species may be rough with smaller tankmates, increasingly so as it ages. This fish is a skilled hunter so smaller tankmates will probably be consumed."
Pet Stores often give very bad advice or they really don't know anything. Some employees or owners of some stores do try to give great advice.
Right now your fish will probably not be compatible long term.
Your Syno likes high Ph African type tank.
Your others all like softer, lower ph, esp your Rams.
My advice ?
Either set up a 100g tank for African Synos or return/rehome him.
return/rehome the Platinum Gourami or cross your fingers and count your Tetras daily.
Pick your favorite fish...build your future tank around that fish. Whether it's getting a Big tank or rehoming some current tank mates before disaster strikes.
If it was me?
Rehome the Platinum and the Syno.
Add more Cardinals.
Add a nice group of Cory Cats IF there is enough plants and caves and cover for the Rams to guard one area and let the Cories live in peace.
Otherwise no other bottom fish so Rams can rule there.
A large group of Cardinals will look awesome. I have 14 Neons in my 55g and plan to add more.
My 55g live planted tank
Feel free to ignore my advice. I don't want to bully you. I used sell fish and managed Pet Stores. I saw a lot of people crash their tanks or lose fish for avoidable reasons.
See if there are any Aquarium or fish clubs in your area. They can be an awesome resource and save you a lot of money.