How to stop guppies fighting in a 10-gallon tank with a betta?

Betta are definitively very territorial and you may notice multiple fights for space at the beginning. Definitively the aquarium must have multiple spots for hiding like Terra Cotta Flowerpots and PVC Piping, moss or bushy plants, ornaments, rocks and driftwoods. This will avoid open fights and will provide good places to have some rest.

I assume it is a male Beta? They typically are very aggressive and will kill other Fish. You could try to put a divider in the tank to keep them separate. I have seen those at most pet stores. Best of luck and thank you for using Pet Coach.

Hi there! The general rule of thumb is 1 gallon for each inch of fish, so I think that you may need a bigger tank. If the bettas are 2 inches each, they each require 2 gallons of water, making the minimum tank size 14 gallons. Since male bettas can be territorial and aggressive, I highly recommend a larger than normal tank with lots of hiding places for 7 fish (at least 20-25 gallons). You should also watch them very carefully for fighting, and have a backup plan in case any of them need to be separated. Good luck!

Unfortunately, aggression between species of fish is not uncommon. I am not sure if this is a new finding, or if anything has changed in the dynamic in your school of fish (any new introductions or any deaths of fish), but this often can then change how the rest of the fish interact with one another. You can try to give the platy places to hide and escape from the guppy, or you can end up dividing the tank. If you do not want to add dividers, you can also separate the guppy into another tank as well. I hope that gives you a place to start, and good luck!

A male Betta can be kept in a 10 gallon tank with 5-6 neon tetras. You will need to monitor for any aggression initially as well as for any fin nipping. Male Bettas are easy to distinguish from females by their brighter colors and larger fins.

Typically beta fish are very territorial and have to be in a tank alone. Otherwise they will fight and possibly kill each other. I would recommend housing the beta alone to help prevent this. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

If there is a strong current, it would not be recommended for a Betta. There is also the water temperature differences for these species to consider. Corys are cooler water fish, doing best in water in the lower 70s F. Bettas do best in warmer water, between 78 F and 80 F. Platys are hardy and adaptable and do well in all but the coolest tanks.