Hello and welcome to the forum. How long have you had him? The reason I ask is the tail biting. Most betta reaction to stress differ. Tail biting is one of those signs. It could be the stress from shipping to the stress of finding himself in a strange new environment in a larger tank that he never saw before. Ranging from no overhead protection, such as plants to hid in or the lack there of. It could be the type of food he is getting. depending on what he was eating before and what he is getting no. to just not having enough of your company. So you see there can be many reasons he is doing this up to being bored.
If you can get us some pictures of the tank he is in and a description of his tank, let us know what he is eating and what the water parameters are when you test. Is the tank heated and filtered?
Hi Old Dog!
I've had him for about a 6 weeks. I think when I bought him he had some fin rot which improved with a round of Kanaplex and frequent PWCs and Indian Almond Leaf.
Then I went on vacation and my husband fed him a lot fewer pellets than I normally do (he may have even forgotten to feed him once or twice) and that is when he ate most of his caudal fin. I do see new growth since have gone back to feeding him 10 Hikari BioGold pellets twice a day and have started adding Seachem StressGuard daily.
I have him in a 5 gallon portrait, heated & filtered tank. The Kanaplex killed my newly cycled filters so I am currently trying to re-cycle the tank. I'm using Tetra Safe Start to help with the fish-in cycle. I'm dosing with Seachem Prime (one drop per gallon) every day during this time to keep ammonia non-toxic to him.
My parameters using API Master Test kit are:
Ammonia 0 to 0.25 ppm
Nitrite - 0
Nitrate - 0 to 5ppm
pH - 6.8 to 7 (it drops a bit when adding a new IAL)
Temp - 78'F to 81'F using a non-adjustable heater
His primary food is Hikari BioGold ~10 pellets 2x daily + dried Daphinia soaked in Vitachem twice per week + a couple of frozen/thawed blood worms as a treat twice per week
He is super active and very curious
Below are some pictures of his tank. I have added a leaf hammock under the water inlet to try and decrease the flow in rest of the tank. He likes his DIY mesh floating tube but wasn't interested in the leaf hammock. I have checked and sanded down any rough spots on tank decorations.
I have been thinking about getting some Frogbit as additional cover.