So, as quite a few breeders know or have found out, bettas can go without developing their ventral fins (for those that may not know- ventral fins are the two dangly fins that protrude downwards from the abdomen, in between the anal (bottom) fin and the head). This thread is meant to be a discussion on this topic- Have you experienced it? Have you stopped it from reoccurring? If so, how? Have you never had this occur? If so, what kind of environmental conditions are he fish being raised in? Etc.
He microworm theory is the big one in the missing ventrals discussion. The theory is essentially that the over feeding of microworms leads to the growth of a bacteria on the bottom that stops/stunts the growth of ventral fins.
I have had a related theory in my head for a while now; that water chemistry plays a role in the condition (perhaps by influencing the bacterial growth). For example, I have hard water with a very high pH (8.2) and I am yet to experience any significant occurrence of missing ventrals, despite my heavy handed microworm feeding. On the flip, amphirion, who feeds less microworms, has experienced missing ventrals. His water is 6.5. A picture (all credit to amphirion) of one of his fish that lacks ventrals follows-
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So, please do post, input would be much appreciated! Here is a quick form that I would like to be filled out if you are a breeder:
Have you raised fish that lack ventral fins?
What is the pH of your water?
What are they fed, in what amounts, and at what times (ex- from 1-2 weeks)?
Do you keep snails, and/or clean the bottom regularly (at least ever second day...- and it's fine to admit that you don't. I don't.)?
Please feel free to add any other theories or discussion material.