Hi, guys.
I've a betta in a 15 gallon Walstad (heavily planted by definition) tank with White Clouds and otos.
The temp is a compromise, around 77, which seems agreeable to all fish concerned.
The White Clouds were actually initially intended for a cool-water tank, but they turned out to be too greedy feeders to be put in with the slow-feeding Central Mud Minnow I dug out of a muddy, drying ditch some years ago, (he's bent in two places and I think his sight is damaged although he gets around really well) so they wound up in with (Mr. Hyperactive) Silk.
I've heard of and from a vast number of people keeping WCM in with bettas and they do seem to do well together.
I don't recall hearing of any WCM ever actually nipping at any bettas tails, despite the prevalence of this combination, so I don't expect that's a common occurrance.
Is it possible they've been mixed up with certain tetras, such as the (often nippy) neon tetras, since WCM were once known as the 'poor man's neon tetra'?
Come to that, I believe cories would really rather not be kept at 80 degrees either, while bettas seem to do fine at mid-high 70's.
Correct me if I'm wrong, (and lord knows I frequently am) but in a pinch, isn't a stable temperature in the area of 76-78 acceptable for most tropical fish?
I have heard a UGF (never used one myself, I know nothink) isn't a good idea for a heavily planted tank for various reasons, one being that the system isn't good for plant growth, another being that the system can get plugged up by plant roots, another being that the plants have to be uprooted and disentangled from the UGF plate when removed for maintenance.
I'm a bit vague on the subject, (since I know nothink myself) but I know I've encountered people giving these as reasons for UGF being unsuitable for a planted tank, although, as stated, I've no idea myself.
But, speaking for myself, I'd hate to buy a system, get set up and plants in only to then discover that this was not a good idea.
As far as filtration current goes, heavy planting will act as a buffer, so the rate of circulation may reduce drastically as plants grow in, depending on what is planted and where the filter is in relation to tall, heavy plant growth.
There are so many potential/probable factors to be considered, a simple one-size-fits-all answer may not always possible...