My white Molly male fish’s upper fin become black, why?

I think your plecos should be fine. They are really tough and will find something to eat (as a last resort – your plants).

Maybe try to spread food evenly and use food that will “last longer”. Pellets or my favourite frozen peas that have been microwaved and deshelled. Peas could work as mollies can’t eat them straight away. Also you could try steamed or boiled (remember: no salt, spices or anything) small broccoli. Mollies, platys, swordfish and plecos seem to like broccoli escpecially flowering part. Peas and broccoli don’t creat “cloud of food” compared to flakes and if they are heated, they will sink fast. Try small amounts first, you can add more later. They idea would be that mollies are too busy eating fresh food, sinking or floating and that gives other fish chance to join the party. Mollies are quicker than guppies or tetras and they are always actively seeking for anything to eat so I can’t guarantee it will work.

2-3 times a day is quite a lot but, it depends how much you give them. Try measuring with teaspoons to find out roughly how much you are giving. Pinch is really difficult to measure. I’ve found out that automatic feeders are not a bad thing. Sometimes you just forget feeding or someone else in the family has already given some food. I’ve had many automatic feeders, but this Eheim feeder is reliable and easy to use…. if you adjust the opening and test it before installing it. Also remember to mark opening setting with white marker.

I hope this helps!

What I’m trying to figure out is how much to feed them all. It seems like the mollies will eat all the time if I let them. However, I’m concerned that they gobble up all the food before some of it can sink far enough for the fry and the tetras to eat it. I’m worried I’m going to overfeed the mollies and make a big mess in the bottom of my tank trying to get food to the other fish.

So far we are just feeding them flake food but based on your post, I’m definitely going to branch out. Will the other fish in the tank also eat the frozen food and algae disks? Do you have any suggestions on or maybe reassurances about the other fish getting some of the food I’m putting in the tank?

Right now we feed them about 2-3 times a day. I put a pinch in and judge how quickly they eat it and then put more in based on that. But I feel like I’m putting in way more than I need to. Sometimes I’m putting in like two or three pinches a session. It seems like they are eating all of it in a pretty fast period of time. Any advice would be greatly appreciated.